[Set-3] Physics MCQ for Competitive Exams

MCQ 1> Which of the following gas has greatest contribution in global warming?

A) CFC
B) NO
C) CH₄
D) CO₂

Answer

CO₂

MCQ 2> Vapor density of a gas is 14. Then the volume occupied by 2.8 g of that gas at STP is

A) 11.2 L
B) 1.12 L
C) 22.4 L
D) 2.24 L

Answer

B) 1.12 L

MCQ 3> There is a small hole in metallic disc. If it is heated then the area of the hole will be

A) Increase
B) Decrease
C) remain unchanged
D) first decrease then increase

Answer

Increase

MCQ 4> For which of the following color does a lens have maximum focal length?

A) Red
B) Orange
C) Greed
D) Violet

Answer

A) Red

MCQ 5> If two resistances each of 10 Ohms are connected in parallel, then the equivalent resistance will be

A) 20 Ohm
B) 10 Ohm
C) 5 Ohm
D) 2.5 Ohm

Answer

C) 5 Ohm

MCQ 6> The source of high energy of sun and various stars is

A) nuclear fusion
B) self-reduction
C) carbon reduction
D) nuclear fission

Answer

Nuclear fission

MCQ 7> Which harmful rays of sun absorbs by ozone layers?

A) X ray
B) Bita Ray
C) Ultraviolet Ray
D) Gama Ray

Answer

Ultraviolet Ray

MCQ 8> What is the dimension of volume expansion coefficient?

A) [K]
B) [K^-1]
C) [MLTK]
D) [MLTK^-1]

Answer

B) [K^-1]

MCQ 9> What is the change of focal length of a lens when it is immersed within water?

A) focal length will increase
B) focal length will decrease
C) remain unchanged

Answer

B) focal length will decrease

MCQ 10> What is the resistance of a filament of a bulb having a rating 220V-110W?

A) 4 Ohm
B) 40 Ohm
C) 400 Ohm
D) 440 Ohm

Answer

D) 440 Ohm