PHYSICS MCQs

The SI unit of intensity of light is:

a) Mole

b) Kelvin

c) Candela

d) Ampere

0.0023 can be expressed in scientific notation as:

a) 23 × 10

b) 0.23 × 10

c) 2.3 × 10

d) None

1024 can be written in scientific notation as

a) 1.024x 103

b) 210

c) 0.000976

d) 1/0300097

Error occurs due to negligence and inexperience of a person is:

a) Systematic Error

b) Random Error

c) Personal Error

d) None

Error in measurement may occur due to

a) Inexperience of a person

b) The faulty apparatus

c) Inappropriate method

d) Due to all reasons in a, b and c

In any measurement the significant figures are

a) All accurately known and all doubtful digits

b) Only accurately known digits

c) Only doubtful digits d) All accurately know digits and the first doubtful

digit

Number of significant figures in 0.0173 are:

a) Three

b) Four

c) Five

d) Two

A student added three figures 72.1, 3.32 and 0.003. The correct answer regarding the rules of the addition of the significant figures will be

a) 75.423

b) 75.42

c) 75.4

d) 75

If the reading is taken with measuring scale whose minimum division is 1mm, then the correct reading is:

a) 0.2145 m

b) 0.21 m

c) 0.214 m

d) None

75.560 is round off as:

a) 75.6

b) 75.7

c) 76.00

d) None

Zero to the right of non-zero digits are:

a) Significant

b) Not significant

c) May or may not be significant

d) None

What is the number of significant figures in the measurement recorded as 8.70 × 10 ?

a) 1

b) 3

c) 4

d) 7

Zero is not significant only if it

a) Lies to the left of a significant digit

b) is between two digits

c) is to the right of a significant digit

d) is before the decimal point

Significant figures in 0.000846 are

a) Six

b) Four

c) Seven

d) Three

The sum of the three numbers, 2.7543, 4.10 and 1.273, up to correct decimal places is

a) 8.1

b) 8.13

c) 8.1273

d) 8.127

73.650 rounded off up to one decimal is

a) 73.6

b) 73.7

c) 74.00

d) 73.65

Absolute uncertainties are added in following operations:

a) Multiplication

b) Division

c) Subtraction

d) None

An accurate measurement is one which has less

a) Precision

b) Absolute uncertainty

c) Fractional uncertainity

d) None

Smaller is the least count of the instrument, more is

the measurement:

a) Accurate

b) Precise

c) Accurate and precise

d) None of these

Which is a correct record for the diameter of wire

when measured my a screw gauge of least count 0.001

cm:

a) 2.3 cm

b) 2.31 cm

c) 2.312 cm

d) 2.3124 cm

Which one of the following is not regarded as a fundamental quantity in Physics?

a) Length

b) Mass

c) Time

d) Weight

The dimension of the following pair is not the same

a) work & energy

b) work and torque

c) Momentum & impulse

d) Mass & moment of inertia

What is the source of energy in artificial satellite?

Radioactive element reserves in D.G Khan Area of Pakistan is:

The best Non-conventional source of energy in Pakistan is:

Who observed the magnetic effect of current ?

In 2010, china become the third country in the world to possess an antisatellite weapon system. The other two countries are:

According to the ancient Greeks , the four elements were earth, water , air and

In 390 BC, which element was added by Plato as a fifth element to the ancient Greeks Elements .?

What will be the pole strength of each piece when a magnetic bar is cut into two pieces :

Speed of sound is maximum in:

At the center of earth mass of a body  :

The Zinc coating on steel or iron objects is called

In a metal wire , the Electric current occurs due to the flow of

Optic fires are mainly used for

Which among the following is a chemical change?

Which of the following is a vector quantity?

The Centigrade & Fahrenheit Temperatures scales became the same at ?

Which among the following is an element?

Taper Turning in lathe machine can be done by:

In electro discharge machining, the tools used for cutting  are usually made of: