# PHYSICS MCQs

(31) A double convex lens acts as a diverging lens when the object is placed
(a) at the focus

(b) at 2f

(c) between f and 2f

(d) within the focal length

The least distance of distinct vision for normal eye is approximately
(a) 10 cm
(b) 15 cm
(c) 20 cm
(d) 25 cm

White light does not focus to a single point after passing through a convex lens due to
(a) chromatic aberration
(b) spherical aberration
(c) distortion
(d) spherical and chromatic aberrations

Chromatic aberration can be removed by using
(a) concave lens
(b) combination of concave and convex lenses
(c) two convex lenses
(d) two concave lenses

Spherical aberration can be reduced by using
(a) double convex lens
(b) central portion of the lens
(c) edge portion of the lens
(d) parallel rays

If placed in contact, the focal length of the combination of two convex lenses of equal focal lengths f,
will be
(a) zero
(b) f/2
(c) f
(d) 2f

If a single convex lens is placed close to the eye, it can be used as a
(a) telescope
(b) simple microscope
(c) compound microscope
(d) refracting telescope

If d is the distance of distinct vision, the magnifying power of a magnifying glass of focal length f is
(a) d/f
(b) f/d
(c) 1 + d/f
(d) 1 + f/d

The objective of a microscope is a lens of
(a) large focal length and converging properties
(b) moderate focal length and diverging properties
(c) very short focal length and converging properties
(d) moderate focal length and converging properties

Stokes law is applicable if body has __________ shape.
(a) rough
(b) square
(c) circular
(d) spherical

One torr is equal to.
(a) 1.333 Nm-2
(b) .1333 Nm-2
(c) 13.33 Nm-2
(d) 133.3 Nm-2

Systolic pressure is called.
(a) low blood pressure
(b) high blood pressure
(c) normal blood pressure
(d) abnormal blood pressure

Instrument used to measure blood pressure is called.
(a) Venturimeter
(b) Blood pressure
(c) Sphygmomanometer
(d) Sonometer

A chimney work best if air exposed to the chimney is,
(a) Stationary
(b) Moving
(c) Moving slowly
(d) Moving fast

Which one is venture relation?
(a) P1 – P2 = 1 / 2 ρV2
(b) V2 = 2g (h1-h2)
(c) P + 1 / 2ρV2 + ρgh = Constant
(d) A1V1 = A2V2 = Constant

The effect of the decrease in pressure with the increase of the speed of fluid in a horizontal pipe is known
as.
(a) Bernoulli’s effect
(b) Torricelli’s effect
(c) Venture effect
(d) Stokes effect

Ideal fluid is.
(a) non-viscous
(b) incompressible
(d) possess all properties

When weight of an object falling freely becomes equal to the drag force, then the body will move with
(a) increasing speed
(b) decreasing speed
(c) constant speed
(d) none of them

The body will move with terminal velocity when it acquires
(a) minimum speed
(b) zero speed
(c) maximum speed
(d) none of them

When the body reaches its terminal velocity, the acceleration of the body becomes
(a) maximum speed
(b) minimum speed
(c) zero
(d) constant quantity

A water hose with an internal diameter of 20 mm at the outlet discharges 30 kg of water in 60 s. what is
water speed at the outlet if density of water is 1000 Kg/m3 during its steady flow.
(a) 1.3 m/s     (b) 1.6m/s
(c) 1.9 m/s     (d) 2.2 m/s

The direction of the streamlines is the same as the direction of the
(a) force        (b) torque
(c) velocity   (d) weight

When the different streamlines cannot cross each other, then this condition is known as
(a) continuity condition
(b) turbulent flow condition
(d) none of them

When each particle of the fluid moves along a smooth path, this path is known as
(a) straight path
(b) smooth path
(c) haphazard path
(d) streamline

During the steady flow, different streamlines
(a) cannot across each other
(b) can across each other
(c) either of them
(d) neither of them

If every particle of the flow that passes a particular point, moves along the same path as followed by
particles which passed the point earlier, then this flow is said to be
(a) turbulent   (b) streamline
(d) abrupt        (d) none of them

When a fluid is in motion, its flow can be considered as
(a) turbulent
(b) streamline
(c) either of them
(d) neither of them

The time required to complete one vibration is called
(a) time period
(b) frequency
(c) time period
(d) velocity

The force which opposes the applied force producing the displacement in the spring is called
(a) restorign force
(b) periodic force
(c) centripetal force
(d) resistive force

The number of vibrations completed by a body in one second is called
(a) time period
(b) frequency
(c) total vibrations
(d) displacement

The distance of vibrating body at any instant from its equilibrium position is called
(a) displacement
(b) frequency
(c) amplitude
(d) time period

For a body executing S.H.M, its
(a) momentum remains constant
(b) potential energy remains constant
(c) kinetic energy remains constant
(d) total energy remains constant

Which of the following does not exhibit S.H.M?
(a) a plucked violin string
(b) a mass attached to a spring
(c) a train shunting between two terminals
(d) a simple pendulum

If the displacement of a body executing S.H.M is plotted against time, then the curve is known
(a) frequency of S.H.M
(b) period of S.H.M
(c) wave form
(d) none of them

The wave from of S.H.M will be
(a) square wave
(b) sine wave
(c) rectified wave
(d) saw tooth wave

An object undergoes S.H.M has maximum speed when its displacement from the mean position is
(a) maximum speed
(b) zero
(c) half of the maximum value
(d) one third of the maximum value

An object undergoes S.H.M has maximum acceleration when its displacement form the mean position is
(a) maximum
(b) zero
(c) half of the maximum value
(d) one third of the maximum value

In vibratory motion.
(a) P.E remains constant
(b) K.E remain constant
(c) Total energy remain constant
(d) Total momentum remain constant

The waveform of S.H.M is.
(a) standing wave
(b) sine wave
(c) square wave
(d) none

S.I unit of frequency is.
(a) vibration s-2
(c) hetz
(d) ms-1

In S.H.M the velocity of a particle is maximum at
(a) mean position
(b) extreme position
(c) Middle between mean and extreme position on the right side.
(d) Middle between mean and extreme position on the left side.

The acceleration of a projection on the diameter for a particle moving along a circle is.
(a) w2x
(b) wx2
(c) –w2x
(d) –wx2

Total energy of a body executing S.H.M, is directly proportional to.
(a) square root of amplitude
(b) the amplitude
(c) reciprocal of amplitude
(d) square of amplitude

The time period of a second pendulum is-
(a) 4 seconds
(b) 3 seconds
(c) 2 seconds
(d) 6 seconds

The length of second pendulum is.
(a) 100 cm
(b) 99 cm
(c) 99.2 cm
(d) 98 cm

If length of second pendulum becomes four times, then its time period will become.
(a) four time
(b) six times
(c) eight time
(d) two times

The force responsible for the vibratory motion of the simple pendulum.
(a) mg cosθ
(b) mg sinθ
(c) mg tanθ
(d) mg

The frequency of the second pendulum is.
(a) 1 hertz
(b) 0.5 hertz
(c) 1.5 hertz
(d) 2.5 hertz

Simple harmonic motion is a type of .
(a) Rotational motion
(b) Circular motion
(c) Musical arrangement
(d) Vibratory motion

The SI unit of force constant is identical with that of.
(a) Force
(b) Pressure
(c) Surface tension
(d) Loudness

When the amplitude of a wave become double, its energy become.
(a) Double
(b) Four times
(c) One half
(d) None time

A simple pendulum suspended form the ceiling of a lift has time period T, when the lift is at rest. When
the lift falls freely, the time period is.
(a) Infinite
(b) T/g
(c) Zero
(d) g/T

The energy of S.H.M is maximum at.
(a) Mean position
(b) Extreme position
(c) In between mean position
(d) All positions during SHM

The product of frequency and time period is equal to.
(a) 1
(b) 2
(c) 3
(d) 4

The displacement of SHM is written as X = Xo sinωt , If
displacement is written by X = Xo cosωt then phase constant will be equal to.
(a) 0
(b) 45
(c) 90
(d) 180

For what displacement the P.E becomes 1⁄4 of its maximum value?
(a) x = xo
(b) x = xo/2
(c) x = xo/4
(d) x = xo2/2

Sharpness of resonance is.
(a) directly proportional to damping force
(b) inversely proportional to damping force
(c) equal to square of damping force
(d) equal to square of damping force

Which one does not work according to resonance?
(a) T.V
(c) Microwave oven
(d) Bulb

The restoring force acting on simple pendulum is given by.
(a) mg sin θ
(b) –mg sin θ
(c) ms cos θ
(d) –mg cos θ

Phase of SHM describes.
(a) Displacement only
(b) Direction of motion only
(c) Both displacement and direction of motion
(d) Neither displacement nor direction of motion

Natural frequency of simple pendulum depends upon.
(a) Its mass
(b) Its length
(c) Square of its length
(d) Square root of its length

Electrical resonance is observed in.
(b) Microwave oven
(c) Both in radio and microwave oven
(d) Neither in radio nor in microwave oven

Total distance traveled by bob of simple pendulum in one vibration is equal to.
(a) Amplitude
(b) Square of amplitude
(c) 2 x amplitude
(d) 4 x amplitude

When K.E energy of SHM is maximum, its.
(a) P.E is zero
(b) Acceleration is zero
(c) Restoring force is zero
(d) All P.E acceleration & restoring force are zero

In damped harmonic oscillation, which one deceases?
(a) Amplitude of vibration
(b) Energy of vibration
(c) Both amplitude and energy
(d) Neither amplitude nor energy

Forced vibration are known as
(a) Simple harmonic vibration
(b) Natural vibration
(c) Driven harmonic vibration
(d) Free vibration

Waves transmit ________ from one place to another.
(a) energy
(b) mass
(c) both
(d) none

The waves that require a material medium for their propagation are
called .
(a) Matter waves
(b) Electromagnetic waves
(c) Carrier waves
(d) Mechanical waves

The distance between any two consecutive crests or troughs is called.
(a) Frequency
(b) Period
(c) Wave length
(d) Phase difference

When two identical traveling waves are superimposed, the velocity of the resultant wave.
(a) Decreases
(b) Increases
(c) Remains unchanged
(d) Becomes zero

In vibrating cord the points where the amplitude is maximum, are called.
(a) antinodes
(b) nodes
(c) troughs
(d) crests

The distance between two consecutive nodes is.
(a) λ/2
(b) λ/4
(c) λ
(d) 2 λ

The distance between consecutive node and antinode is.
(a) λ
(b) λ/2
(c) 2λ
(d) λ/4

If stretching force is T of wire increases, then its frequency
(a) Deceases
(b) Increases
(c) Remains the same
(d) Any of above

A stationary wave is set up in the air column of a closed pipe. At the closes end of the pipe
(a) Always an node is formed
(b) Always an antinode is formed
(c) Neither node nor antinode is formed
(d) Sometimes a node and sometimes an antinode is formed

It is possible to distinguish between transverse and longitudinal waves form the property of
(a) Refraction
(b) Polarization
(c) Interference
(d) Diffraction

according to Laplace correction sound travel in air under the conditions of
(b) isothermal
(c) isobaric
(d) isochoric

Sound waves do not travel in vacuum because
(a) They are transverse waves
(b) They are stationary waves
(c) They require material medium for propagation
(d) They do not have enough energy

Velocity of sound is vacuum is
(a) 332 ms-1
(b) 320 ms-1
(c) zero
(d) 224 ms-1

Increase in velocity of sound in the air for 1 degree Centigrade rise in temperature is
(a) 1.61 ms-1
(b) 61.0 ms-1
(c) 0.61 ms-1
(d) 2.00 ms-1

The velocity of sound is greatest in
(a) Water
(b) Air
(c) Copper
(d) Ammonia

On loading the prong of a tuning form with wax, its frequency
(a) Increase
(b) Decrease
(c) Remains unchanged
(d) May increase or decrease

The velocity of sound in air would become double its velocity at degree centrigrade at temperature

The normal ear is the most sensitive in the frequency range
(a) 20,000 to 30,000 hertz
(b) 10 to 20 hertz
(c) 2000 to 4000 hertz
(d) 6000 to 8000 hertz

Ultrasonics have
(a) Frequency in the audible range
(b) Frequency is greater than 20 kHz
(c) Frequency lower than 20 Hz
(d) All of above

The periodic alternation of sound between maximum and minimum loudness are called
(a) Silence zone
(b) Interference
(c) Beats
(d) Resonance

The number of beats produced per second is equal to
(a) The sum of the frequencies of two tuning forks
(b) The difference of the frequencies of two tuning forks.
(c) The ratio of the frequencies of two tuning forks
(d) The frequency of either of the two tuning forks

Beats are the results of
(a) Diffraction of sound waves
(b) Constructive and destructive interference
(c) Polarization
(d) Destructive interference

Silence zone takes place due to
(a) Constructive interference
(b) Destructive interference
(c) Beats
(d) Resonance

Doppler effect applies to
(a) Sound wave only
(b) Light wave only
(c) Both sound and light wave
(d) Neither sound nor light wave

When the source of sound moves away form a stationary listener, then ___________occurs.
(a) an apparent increase in frequency
(b) an apparent decrease in frequency
(c) an apparent decrease in wavelength
(d) an apparent change in frequency

A simple pendulum has a bob of mass ‘m’ and its frequency is ‘f’. If we replaced the bob with a heavier one, say of ‘2m’, then what will be its new frequency?
(a) 1/4f
(b) 1/2f
(c) f
(d) 2f

Which one is the correct relation for fundamental frequency of open and closed pipe?
(a) fopen = 2 f closed
(b) f closed = 2fopen
(c) fopen = f closed
(d) f open = 1 / f closed

In open organ pipe
(a) Only even harmonics are present
(b) Only odd harmonic are present
(c) Both even and odd harmonics are present
(d) Selected harmonics are present

Which one is the correct relation?
(a) V Newton = V Laplace
(b) V Newton = γV Laplace
(c) V Newton = √γ V Laplace
(d) V Laplace = √γ V Newton

The dimension of elastic modulus ε is
(a) ML-1T-2
(b) ML-2T-2
(c) MLT-2
(d) ML2T-2

When a transverse wave is reflected on going from a denser to a rarer medium, then at the boundary the reflected wave undergoes a phase change of:
(a) 0         (b) 90
(c) -90     (d) 180

When a wave is reflected on going from a rarer to a denser medium, then at the boundary the reflected wave will undergo a phase change of:
(a) 0         (b) 90
(c) -90     (d) 180

A wave has a wavelength of 1 cm and a period of 2 sec. Its wave speed is:
(a) 0.5 m/sec        (b) 5 cm/sec
(c) 2.50 cm/sec    (d) 0.5 cm/sec

If the distance between a compression and an adjacent rarefaction is 2 cm and the wave speed of the wave is 4 cm/sec, then its wavelength is
(a) 2 cm     (b) 4 cm
(c) 8 cm     (d) 1⁄2 cm

The intensity of a wave is the transfer of
a) energy per unit area normal to direction of wave propagation
(b) power per unit area normal to direction of wave propagation
(c) amplitude normal to direction of the wave propagation
(d) power per unit area parallel to direction of wave propagation

Two wave trains of the same amplitude and frequency travelling in opposite directions along the same path in the same medium produce:
(a) resonance (b) beats
(c) standing waves (d) musical notes

When body is in motion its ____________ always changes.
(a) Velocity
(b) Acceleration
(c) Position vector
(d) Momentum

A body is moving with uniform velocity. Its,
(a) speed changes
(b) acceleration changes
(c) direction of motion changes
(d) displacement from origin changes

A man is in a car is moving with velocity of 36Km/hr. his speed with respect to the car is.
(a) 10m/s
(b) 36m/s
(c) zero
(d) infinite

When velocity time graph is a straight line parallel to time axis then.
(a) acceleration is const
(b) acceleration is variable
(c) acceleration is zero
(d) velocity is zero

Area under velocity time graph represent.
(a) force
(b) momentum
(c) distance
(d) acceleration

Slope of velocity time graph is.
(a) acceleration
(b) distance
(c) force
(d) momentum

Newton’s laws do not hold good for particles.
(a) at rest
(b) moving slowly
(c) high velocity
(d) move with velocity comparable to velocity of light

1st law of motion gives the definition of.
(a) rest
(b) motion
(c) velocity
(d) force

(11) 2nd law of motion gives the definition of.
(a) force
(b) acceleration
(c) velocity
(d) both force and acceleration

3rd law of motion explains.
(a) effect of force
(b) existence of a force
(c) existence of two forces
(d) existences of pair of forces in nature

Momentum depends upon.
(a) fore act on the body
(b) mass of the body
(c) velocity of the body
(d) both mass and velocity of the body

Which of the following pair has same direction always?
(a) force, displacement
(b) force, velocity
(c) force, acceleration
(d) force, momentum

Motorcycle safety helmet extend the time of collision hence decreasing the.
(a) chance of collision
(b) force acting

(c) velocity
(d) impulse

The collision between two bodies be elastic if bodies are.
(a) solid and soft
(b) soft and elastic
(c) solid and hard
(d) hard and elastic

During long jump, athlete runs before taking the jump. By doing so he.
(a) provide him a larger inertia
(b) decrease his inertia
(c) decrease his momentum
(d) increase his momentum

When car takes turn around a curve road, the passengers feel a force acting on them in a
direction away from the center of the curve. It is due to.
(a) centripetal force
(b) gravitational force
(c) their inertia
(d) centrifugal force

A body is falling freely under gravity. How much distance it falls during an interval of time between 1st
and 2nd seconds of its motion, taking g = 10?
(a) 14 m
(b) 20 m
(c) 5 m
(d) 25 m

What is the shape of velocity time graph for constant acceleration?
(a) straight line
(b) parabola
(c) inclined curve
(d) declined curve

When collision between the bodies in a system is inelastic in nature then for system.
(a) momentum changes but K.E remain conserve
(b) K.E changes but momentum remain conserve
(c) Both momentum and K.E changes
(d) Both momentum and K.E remain conserve

Which shows the correct relation between time of flight T and maximum
height H?
(a) H = gT2 / 8
(b) H = 8T2 / g
(c) H = 8g/T2
(d) H = 8/gT2

The acceleration in the rocket all any instant is proportional to the nth power of the velocity of the
expelled gases. Where the value of n must be ?
(a) -1
(b) 1

(c) -2
(d) 2

Taking off rocket can be explained by.
(a) 1st law of motion
(b) 2nd law of motion
(c) law of conservation of momentum
(d) law of conservation of energy

Which of the following is not an example of projectile motion.
(a) A gas filled balloon
(b) Bullet fired from gun
(c) A football kicked
(d) A base ball shot

What is the angle of projection for which the range and maximum height become equal?
(a) Tan-1 1/4
(b) Tan-1 4
(c) Tan-1 1/2
(d) Tan-1 2

The thrust on the rocket in the absence of gravitational force of attraction is.
(a) Constant
(b) Not constant
(c) Constant if the rate of ejected gases is constant
(d) Constant for short range rocket

When two bodies move toward each other with constant speeds the distance between them deceases at the
rate of 6m/sec. if they move in the same direction the distance between them increases at the rate of
4m/sec. Then their speeds are.
(a) 5m/s, 1m/s
(b) 3m/s, 3m/s
(c) 6m/s, 1m/s
(d) 4m/s, 2m/s

Distance covered by a freely falling body in 2 seconds will be.
(a) 4.9 m
(b) 19.6m
(c) 39.2m
(d) 44.1m

Flight of a rocket in the space is an example of.
(a) Second law of motion.
(b) Third law of motion
(c) First law of motion
(d) Law of gravitation

The trajectory (or path) of a projectile is.
(a) Straight line
(b) Parabola
(c) Hyperbola
(d) Circle

The limit of the average velocity over a path length that approaches zero but always includes the point ‘A’
is defined as
(a) speed at ‘A’
(b) instantaneous velocity at ‘A’
(c) acceleration at ‘A’
(d) average speed at ‘A’.

Uniform acceleration results in a velocity which:
(a) remains constant
(b) varies linearly with time
(b) zero
(d) none of these.

Inertia of an object is quantitative measure of its.
(a) Volume
(b) Density
(c) Mass
(d) Temperature

The horizontal range of a projectile, at a certain place, is completely determined by
(a) the angle of projection
(b) the initial velocity of projection
(c) the mass of the projectile
(d) speed and mass of the projectile

Range of a projectile on a horizontal plane is same for the following pair of angles:
(a) 300 and 600

(b) 200 and 800
(c) 00 and 450

(d) 100 and 900

A man wanting to shoot at a fixed target should aim
(a) directly at the target
(b) slightly higher
(c) slightly lower
(d) slightly sideways

A projectile is fired horizontally off a 490 m high cliff with a muzzle velocity of 80 m/sec. The time taken
by the projectile to reach the ground is
(a) 2.5 sec     (b) 7.5 sec
(c) 5.0 sec     (d) 10 sec

A projectile is fired horizontally off a 490 m high cliff with a muzzle velocity of 80 m/sec. How far
from the bottom of the cliff will the projectile land ?
(a) 200 m         (b) 400 m
(c) 800 m      (d) 1600 m

A missile is fired with a speed of 98 m/sec at 30o with the horizontal. The missile is airborne for
(a) 10 sec     (b) 20 sec
(c) 30 sec       (d) 40 sec

A missile is fired with 98 m/sec at 30o with the horizontal. It reaches a maximum height of
(a) 196 m           (b) 98 m
(c) 122.5 m      (d) 2940 m

The range of a projectile is 8000 m and its summit is 3000 m high. How far is the summit from the
point of projection?.
(a) 3000 m      (b) 8000 m
(c) 5000 m    (d) 11000 m

Work done will be maximum if the angle between the force F and
displacement d is.
(a) 45
(b) 90
(c) 180
(d) 0

A field in which the work done in a moving a body along closed path is zero is called.
(a) electric field
(b) conservative field
(c) electromagnetic field
(d) maximum

When a force is parallel to the direction of motion of the boyd, then work done on the body is.
(a) zero
(b) minimum
(c) infinity
(d) maximum

Which of the following types of force can do no work on the particle on which it acts?
(a) frictional force
(b) gravitational force
(c) elastic force
(d) centripetal force

If a body a mass of 3 kg is raised vertically through 2m, then the work done will be.
(a) 38. 2 J
(b) 392.1 J
(c) 39.2J
(d) 3.92J

An elevator weighing 3.5 x 10-6 N is raised to a height of 1000 m in the absence of friction, the work done.
(a) 3.5 x 103 J
(b) 3.5 x 104 J
(c) 3.5 x 106 J
(d) 3.5 x 109 J

The average power and instantaneous power become equal if work is done at.
(a) any rate
(b) at variable rate
(c) at uniform rate
(d) at high rate

The relation between horse power and watt is.
(a) 1 hp = 546 watts
(b) 1 hp = 746 watts
(c) 1 hp = 1000 watts
(d) 1 hp = 946 watts

Proton, electron, neutron and a particles have same momentum. Which of them have highest K.E?
(a) proton
(b) electron
(c) neutron
(d) a-particle

Slope of work time graph is equal to.
(a) displacement
(b) acceleration
(c) power
(d) energy

Work done by variable force is determine by dividing.
(a) force into small interval
(b) displacement into small interval
(c) both force and displacement into small intervals
(d) force into small and displacement into large intervals

Work done on the body equals to the.
(a) change in its K.E always
(b) change in its P.E always
(c) change in it K.E and change in its P.E
(d) neither change in K.E nor change in its P.E

The escape velocity of a body in gravitational field of earth is independent of.
(a) its mass
(b) the angle at which its is thrown
(c) both its mass and the angle at which it is thrown
(d) gravitational field of earth

The tides raise the mater in the see roughly in a day.
(a) once
(b) twice
(c) four time
(d) eight time

The source of geothermal energy is.
(a) decay of radioactive element in the earth
(b) compression of material in the earth
(c) residual lost of the earth
(d) all as said in a, b and c

The highest value of escape velocity in solar system is for planet .
(a) Earth
(b) Neptune
(c) Jupiter
(d) Moon

Work done by the force of friction is.
(a) always positive
(b) always negative

(c) positive only for small frictional force
(d) positive only for large frictional force

P.E of a body has.
(a) no formula
(b) a formula mgh only
(c) a formula
(d) no general formula

If velocity is double, then.
(a) momentum increase 4 times and K.E increases 2 times
(b) momentum and K.E remain same
(c) momentum increases 2 times and K.E increase constant
(d) momentum increases 2 times and K.E increases 4 times

When the speed of a moving body is doubled, then.
(a) its K.E is doubled
(b) its acceleration is doubled
(c) its P.E is doubled
(d) its momentum is doubled

One mega watt hour is equal to.
(a) 36x 106 J
(b) 36x 1012 J
(c) 36x 109 J
(d) 36x 108 J

Which of the following is not conservative force.
(a) Friction
(b) electric
(c) gravitational
(d) magnetic

Work has the dimension as that of same as that of.
(a) torque
(b) angular momentum
(c) linear momentum
(d) power

The consumption of energy by a 60 watt bulb in 2 sec is.
(a) 120 J
(b) 60 J
(c) 30 J
(d) 0.02 J

The relation between the escape velocity Vesc and orbital speed Vo is given by.
(a) Vesc = 1 /2Vo
(b) Vesc = √2 Vo
(c) Vesc = Vo
(d) Vesc = 2Vo

The escape velocity form the earth surface in km s-1 is.
(a) 4.2 km s-1
(b) 7.5 km s-1
(c) 9.5 km s-1
(d) 11 km s-1

If moon radius is 1600 km and g on its surface is 1.6 ms-2, then the escape velocity on the moon is.

1600 ms-1
(b) 50.6 ms-1
(c) 71.6 ms-1
(d) 2263 ms-1

When two protons are brought together.
(a) Kinetic energy increases
(b) P.E between them increases
(c) P.E between them decreases
(d) P.E between them do not change

When arrow is released from its bow, its energy is transformed from.
(a) heat energy to K.E
(b) elastic P.E to K.E
(c) chemical energy to elastic P.E
(d) K.E to elastic P.E

A man lifts, vertically, a weight of 40 kg through 1m in 10s: while a child lifts, vertically, a weight of 10 kg
through a distance of 1m in 1s. What will be correct inference?
(a) man does more than child
(b) child does more work than man
(c) both do the same amount of work
(d) it is a foolish question.

A man carries a 1 kg suitcase 10 m horizontally across the corridor and then goes up the stairs of total height
10 m. The work done by the man is
(a) 0 J        (b) 4.9 J
(c) 196 J    (d) 98 J

A 100 kg car starting from rest runs down a 30o slope. If the total length of the slope is 20 m, the speed
of the car at the bottom, ignoring friction, is
(a) 14000 3 m/sec          (b) 1.4 m/sec
(c) 20 sin 30o m/sec      (d) 14 m/sec

A 2m tall man standing at the top of a 30 m tall tower raises a 1 kg mass 0.5 m above his head. The potential
energy of the raised mass may be considered to be
(a) 4.9 J         (b) 24.5 J
(c) 316.5 J     (d) all of the above

A body is falling freely under gravity from point A to point B. The energy of the body at the point C is
(a) is less than its energy at A
(b) is equal to its energy at A
(b) is grater than its energy at A
(d) none of these

When two protons are brought closer together, the P. E. between them
(a) remains constant     (b) increases
(c) decreases                   (d) approaches zero

If a car is moving at a constant speed of 25 m/sec and the total frictional forces acting on it amounts to 1000
N, then the engine power of the car is
(a) 250 joule sec-1     (b) 2500 watt
(c) 25 k watt                (d) 500 k watt

If you weigh 500 N and in 5 seconds you can run up a flight of stairs consisting of 40 steps, each 15 cm high,
(a) 3000 J         (b) 3000 J sec-1
(c) 600 watt      (d) 60 kilowatt

One horsepower equals
(a) 273 W     (b) 746 W
(c) 500 W     (d) 1 kilowatt

The horse-power required to pump up 2500 kg of water up 100 m in 5 minutes is:
(a) 10.9 hp      (b) 25 hp
(c) 15 hp          (d) 5 hp

Water falls over a fall of 30 m at a rate of 45 3106 kg/min. The power generated is:
(a) 200 MW     (b) 210 MW
(c) 220 MW     (d) 230 MW

The rotational K.E of hoop is equal to the.
(a) its translational K.E
(b) half than its translational K.E
(c) double than its translational K.E
(d) four times than its translational K.E

A hoop and disc have same mass and radius. Their rotational K.E are related by an equation.
(a) K.Ehoop = K.E disc
(b) K.Ehoop = 2K.E disc
(c) K.Ehoop = 1/2K.E disc
(d) K.Ehoop = 4K.E disc

The critical speed of an artificial satellite is.
(a) 6 Kms-1
(b) 8.1 Kms-1
(c) 7.9 Kms-1
(d) 8 ms-1

Geo-stationary satellite completes one rotation around earth in.
(a) 3 hours
(b) 6 hours
(c) 12 hours
(d) 12 hours

Radius of geo-stationary orbit form center of earth is nearly.
(a) 42000 km
(b) 36000 km
(c) 24000 km
(d) 18000 km

According to Einstein, the gravity interaction is possible between.
(a) material objects only
(b) material objects and electromagnetic radiation only
(d) none of the above.

(a) 67.3o
(b) 57.3o
(c) 87.3o
(d) 60o

The direction of linear velocity of body moving in a circle is.
(a) along the axis of rotation
(b) along the tangent
(c) directed towards the center
(d) directed away from the center

When a body moves in a circle, the angle between its linear velocity and angular velocity is always.
(a) 180
(b) 0
(c) 90
(d) 45

When a body is whirled in a horizontal circle by means of a string the centripetal force is supplied by.
(a) mass of a body
(b) velocity of body
(c) tension in the string
(d) centripetal the string

Centripetal force performs .
(a) maximum work
(b) minimum work
(c) negative work
(d) no work

When a body moves in a circle of radius ‘r’ with linear speed ‘V’, its centripetal force is.
(a) mV / r2
(b) mV / r
(c) mV2 / r
(d) mV2 / r2

A stone is whirled in a vertical circle at the end of a string. When the stone is at the highest position the
tension is the string is.
(a) maximum
(b) zero
(c) equal to the weight of the stone
(d) less than the weight of the stone

The span of broad jump depends upon.
(a) mass of the jumper
(b) height of jump
(c) angle of projection
(d) none

In case planets the necessary acceleration is provided by.
(a) Gravitational force
(b) Frictional force
(c) Coulomb force
(d) Centripetal force

If a car moves with a uniform speed of 2 ms-2 in a circle of radius 0.4. its angular speed is.

A body can have constant velocity when it follows a.
(a) elliptical path
(b) circular path
(c) parabolic path
(d) rectilinear path

A cyclist cycling around a circular racing track, skids because
(a) the centripetal force upon him is less than limiting friction
(b) the centripetal force upon him is greater than limiting friction
(c) the centripetal force upon him is equal to the limiting friction
(d) the friction between the tyres of the cycle and road vanishes

What is outward force acting on a mass of 10 kg when rotating at one end of an inelastic string 10m long
at speed of 1m/s?
(a) 1N
(b) 10N
(c) 2N
(d) 100N

If we whirl a stone at the end of a string in the vertical circle, it is likely to break when the stone is .
(a) at the highest point
(b) at the lowest point
(c) at any point during motion
(d) at the point where gravity is not acting

A body moving along the circumference of a circle completes two revolutions. If the radius of the circular
path is R, the ratio of displacement to the covered path will be ____________.
(a) √R
(b) 2√R
(c) zero
(d) 4√R

A man of weight W is standing on an elevator which is ascending with an acceleration a. The apparent
weight of the man is.
(a) mg
(b) mg – ma
(c) mg + ma
(d) mg – ma

Which one of the following planets is closer to the sun?
(a) Pluto
(b) Venus
(c) Mercury
(d) Mars

The planet nearest to the earth is.
(a) Venus
(b) Mars
(c) Uranus
(d) Sun

A satellite moving round the earth constitutes.
(a) An inertial frame of reference
(b) Non inertial frame
(c) Neither inertial nor non inertial
(d) Both inertial and non inertial

Minimum number of communication satellites required to cover the whole earth is
(a) 4
(b) 3
(c) 2
(d) 5

A body of 2 kg is suspended from the ceiling of an elevator moving up with an acceleration g. its apparent
weight in the elevator will be
(a) 9.8 N
(b) 19.6 N
(c) 129.4 N
(d) 39.2 N

If a body of mass 10 kg is allowed to fall freely, its weight becomes.
(a) zero
(b) 98N
(c) 9.8N
(d) 10N

How many days would be in a year if the distance between the earth and the sun were reduced to half of
its present value (assuming circular orbit)?
(a) 365 days
(b) 730 days
(c) 329 days
(d) 129 days

When a body is moving along a circular, path, it covers a certain angle in a given internal of time. Such
type of motion is.
(a) vibratory motion
(b) linear motion
(c) rotatory motion
(d) angular motion

Coefficient of viscosity of honey is greater than.
(a) milk
(b) water
(c) tarcoal
(d) water

The dimensions of coefficient of viscosity are.
(a) ML-1T-1
(b) M2L1T1
(c) ML1T-1
(d) M2L-1T-1

Terminal velocity is.
(a) uniform
(b) maximum
(c) uniform and maximum
(d) neither uniform nor maximum

When body moves with terminal velocity the acceleration in the body become.
(a) zero
(b) maximum
(c) variable
(d) infinite

Terminal velocity is given by equation.
(a) Vt = gr2r/η
(b) Vt = gr2r/9η
(c) Vt = gr2r/9η
(d) Vt = 9gr2r/2η

Terminal velocity of the body is directly proportional to the.
(a) diameter of the body
(b) size of the body

(c) square of the diameter of the body

The flow of ideal fluid is always.
(a) turbulent
(b) streamline
(c) irregular
(d) straight line

Drag force is given by.
(a) Newton’s law
(b) Pascal’s law
(c) Gauss’s law
(d) Stoke’s law

When fluid is incompressible then.
(a) velocity of the fluid is constant
(b) flow of the fluid is constant
(c) density of the fluid is constant
(d) volume of the fluid is constant

Irregular flow of fluid is called.
(a) streamline
(b) turbulent
(c) uniform
(d) laminar

According to equation of continuity, A1V1 = A2V2 = constant.
The constant is equal to.
(a) flow rate
(b) volume of fluid
(c) mass of fluid
(d) density of fluid

Equation of continuity is obtained by apply in law of conservation of.
(e) mass
(f) energy
(g) momentum
(h) all

Velocity of fluid increases where the pressure is.
(a) low
(b) high
(c) constant
(d) changes continuously

Speed of efflux can be determined by applying.
(a) Bernoull’s theorem
(b) Torricelli’s theorem
(c) Venture relation
(d) All

Blood vessels are.
(a) rigid
(b) not rigid
(c) of glass
(d) of rubber

Concentration of red cells in blood is about.
(a) 25%
(b) 40%
(c) 50%
(d) 75%

A man standing near a fast moving train may fall.
(a) on the train
(b) away from the train
(c) towards the train
(d) on himself

For which position, maximum blood pressure in the body have the smallest value ?
(a) standing straight
(b) sitting on chair
(c) sitting on ground
(d) lying horizontally

Two fog droplets have radius 2:3, their terminal velocities are .
(a) 4:6
(b) 4:9
(c) 2:9
(d) 4:3

Burnoulli’s equation is obtained by applying law of conservation of .
(a) mass
(b) energy
(c) momentum
(d) fluid

Venturi meter is used to measure.
(a) fluid pressure
(b) fluid density
(c) fluid speed
(d) none

In cricket when a bowler produce reverse swing, the ball will move
towards.
(a) Shinning side of the ball
(b) Rough side
(c) Seam of the ball
(d) Goes straight

Rectangular coordinate system is also called.
(a) polar coordinate system
(b) Cartesian coordinate system
(c) Cylindrical coordinate system
(d) Space coordinate system

The direction of a vector in space is specified by.
(a) one angle
(b) two angle
(c) three angle
(d) no angle

(a) commutative law
(b) distributive law
(c) associative law
(d) all given laws in a, b and c.

A vector can be multiplied by number. The number may be.
(a) dimensionless
(b) dimensional scalar
(c) negative
(d) all a, b and c are correct.

Unit vector nˆ is along.
(a) x-axis
(b) normal on a surface
(c) y-axis
(d) z-axis

cosθi^+ sinθj^ is a.
(a) vector
(b) unit vector
(c) vector in the direction at angle with x-axis
(d) unit vector in the direction at angle θ with x-axis

Maximum number of rectangular components are
(a) one
(b) two
(c) three
(d) infinite

Maximum number of components of a vector may be.
(a) one
(b) two
(c) three
(d) infinite

The resultant of two forces of equal magnitudes is also equal to the magnitude of the forces. The angle between the two forces is.
(a) 30
(b) 60
(c) 90
(d) 120

What is the angle that the given vector makes with y-axis?
A = 2i^+ √ 12j^
(a) 20
(b) 60
(c) 90
(d) 120

Two vectors A and B are making angle θ with each other. The scalar projection of vector B on vector A is
written as.
(a) A.B/ A
(b) A.B/ B
(c) A. cos θ
(d) Both a and b are correct.

If A=B which of the following is not correct?
(a) A .B = A^ .B^
(b) |A| = |B|
(c) |A^| = |B^|
(d) AB^= BA^

i^. (j^x k^) is equal to.
(a) 1
(b) i^
(c) j^
(d) k^

Which one is not a correct relation?
(a) A x B = -BxA
(b) |AxB| = – |BxA|
(c) AxB = AB Sinθn^
(d) BxA = AB Sinθ(-n^)

The direction of vector product is given by.
(b) right hand rule
(c) left hand rule
(d) triangular rule

If east, west, north, south, up and down are representing the direction of unit vectors, then east x south has
direction along.
(a) west
(b) north
(c) down
(d) up

Null vector is a vector which has.
(a) zero magnitude
(b) no specified direction
(c) both a and b are correct
(d) both a and b are not correct

(21) Which one is a unit vector?
(a) √3 i^+ √3 j^ + √3 k^
(b) 1√3 i^ + 1/ √3 j^ + 1√3 k^
(c) √3/3 i^ + √3/3 j^+ √3/3 k^
(d) both b and c are correct

Angle between two vectors A and B can be determined by.
(a) their dot product
(b) their cross product
(d) right hand rule

The magnitude of cross product is equal to the dot product between the. The angle between the two vector
is.
(a) 30
(b) 45
(c) 60
(d) 180

Torque is defined as.
(a) turning effect of force
(b) cross product of force and position vector
(c) product of force and moment arm
(d) all a, b and c are correct

The dimension of torque is.
(a) [ML+2T-2]
(b) [MLT-2]
(c) [ML2T]
(d) [ML-2T-2]

SI unit of torque is.
(a) N . m
(b) Joule
(c) Both a and b are correct
(d) Neither a nor be is correct

Torque acting on a body determines.
(a) acceleration
(b) linear acceleration
(c) angular acceleration
(d) direction of motion of the body

A body in equilibrium.
(a) always at rest
(b) always in uniform motion
(c) may be at rest or in uniform motion
(d) may be at rest or in motion

A body will be in complete equilibrium when it is satisfying.
(a) 1st condition of equilibrium
(b) 2nd condition of equilibrium
(c) both 1st and 2nd condition of equilibrium
(d) impossible

Which one is not a type of dynamic equilibrium?
(a) rotational equilibrium
(b) translational equilibrium
(c) static equilibrium
(d) both a and c are correct answer

Three coplanar force acting on a body keep it in equilibrium. They should therefore be.
(a) concurrent
(b) non concurrent
(c) parallel
(d) non parallel

Which of the following pairs does not have identical dimensions?
(a) torque and energy
(b) momentum and impulse
(c) energy and work
(d) mass and moment of iner

A central force.
(a) can produce torque
(b) can’t produce torque
(c) some time can produce torque some time can’t
(d) it has no relation with torque

It is easier to turn a steering wheel with both hands than with a single hand because.
(a) acceleration force increases on the wheel
(b) two forces act on the wheel
(c) two hands provide firm grip
(d) couple acts on the wheel

The cross product i^ x j^ is equal to.
(a) zero
(b) one
(c) –k^
(d) k^

In which quadrant, only value of ‘tan’ will be positive?
(a) first
(b) second
(c) third
(d) both 1st and 3rd

The cross product of two vectors is a negative vector when.
(a) they are parallel vectors
(b) they are anti parallel vectors
(c) they are perpendicular vector
(d) they are rotated through 270

The branch of physics which deals with the ultimate particles of which the matter is composed is:

a) Plasma physics

b) Atomic physics

c) Nuclear physics

d) Particle physics

The branch of physics which deals with atomic nuclei is called

a) Acoustics

b) Thermodynamics

c) Magnetism

d) Nuclear physics

Silicon is abundantly obtained from:

a) Water

b) Metal

c) Sand

d) Stones

The number of base units are:

a) Three

b) Five

c) Seven

d) Nine

Which of the following is a derived quantity:

a) Force

b) Mass

c) Length

d) Time

Which of the following is SI base unit?

a) gram

b) slug

c) Newton

d) kilogram

Which one of the following is not a unit of length:

a) Angstrom

b) Micron

d) Light year

Which is not a base unit in SI units?

a) Kilogram

b) Joule

c) Ampere

d) Kelvin

An example of derived unit is a) Candela

b) Ampere

c) Coulomb

d) Mole

Candela is the SI unit of

a) Charge

b) Luminous intensity

c) Power

d) Refractive index

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