Railway NTPC Physics Questions

In RRB NTPC Exam General Science is one of the most important section, lots of questions will be asked from this section. so the candidate must prepare all the important General science questions to clear CBT 1 the examination. In this article, we are going to share Expected physics MCQ questions for RRB NTPC Exam. You must check out these questions before appearing in the examination.

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Q.1 The instrument used to measure atmospheric pressure is

(a) Pyrometer

(b) Eudiometer

(c) Barometer

(d) Hydrometer

Ans: (c)

Q.2 A hydraulic brake in an automobile uses

(a)    a fluid to transmit the braking force

(b) the force applied by the driver

(c) hydrogen gas and not any liquid

(d) a vacuum brake

Ans: (a)

Q.3 In a hydraulic pressure

(a)    force on each square centimetre of the small piston is less than the force on each square centimetre of the large piston

(b)    the distance the small piston moves is equal to the distance the large piston moves

(c)     applied pressure is equally transmitted throughout the liquid in all directions

(d)    force acting on small piston is equal to the force acting on large piston

Ans: (c)

Q.4 Mercury is used in a barometer because

(a)    its density being very high 13.6 g/cm3 the height of mercury column is conveniently small

(b)    at the ordinary temperature its vapour pressure is small

(c) it is opaque and does not wet glass

(d) All the above

Ans: (d)

Q.5 The hydraulic jack to lift heavy vehicles in automobile service stations is one of the applications of

(a) Pascal’s law

(b) Principle of Archimedes

(c) Boyle’s law

(d) Hooke’s law

Ans: (a)

Q.6 A simple mercury barometer is found in a slightly slanting position. The atmospheric pressure

(a)    is found by measuring the slanting height of the mercury column

(b) is given by the vertical height

(c) cannot be measured with it

(d)    u) can be measured by both the methods described above

Ans: (b)

Q.7 The instrument used to determine the RD (Relative Density) of a liquid by the principle of floatation is

(a) Hygrometer

(b) Hypsometer

(c) Hydrometer

(d) Densimeter

Ans: (c)

Q.8 A lactometer la used to

(a)    find out the specific gravity of liquids

(b) measure the volumes of liquids

(c) test the purity of milk

(d)    determine the strength of acid in car batteries

Ans: (c)

Q.9 Solids have definite shapes. This is because

(a)    the forces of cohesion of the molecules within are very much less in them

(b)    the forces of cohesion are very large

(c) the forces of adhesion are large

(d) the forces of adhesion are less

Ans: (b)

Q.10 The attraction of unlike molecules at the common surface is known as

(a) adhesion

(b) cohesion

(c) surface tension

(d) capillarity

Ans: (a)

Q.11 Mercury does not stick to glass because

(a)    cohesive forces between the mercury molecules are greater than adhesive forces between mercury and glass molecules

(b)    the adhesive forces between mercury and glass molecules are greater than the cohesive forces

(c) both the cohesive and adhesive forces are equal

(d) None of the above

Ans: (a)

Q.12 In a river, the currents are fastest where the river la

(a) wide and shallow

(b) narrow and shallow

(c) wide and deep

(d) narrow and deep

Ans: (b)

Q.13 Pieces of camphor placed on water move about rapidly. This is because of

(a) diffusion

(b) viscosity

(c) surface tension

(d) capillarity

Ans: (c)

Q.14 In compact porous soil, the rising of the water is due to

(a) capillarity

(b) cohesion

(c) adhesion

(d) viscosity

Ans: (a)

Q.15 The mixing up of two gases as a result of random motion of molecules is called

(a) diffusion

(b) effusion

(c) vaporisation

(d) sublimation

Ans: (a)

Q.16  When a bottle of perfume la opened in one corner of a room the smell spreads soon throughout the room. This is an example of

(a) surface tension

(b) capillarity

(c) viscosity

(d) diffusion

Ans: (d)

Q.17 When a bowler spins a ball, it changes its direction in the air. This is due to

(a) turbulence caused by the wind

(b) buoyancy of air

(c) unequal pressures acting on it

(d)    sudden change in the direction of the wind

Ans: (c)

Q.18 A capillary tube is partially dipped vertically in a vessel containing water. Due to capillarity water rises in the tube. The height of water rise in the tube can be increased by

(a)    decreasing the radius of the capillary tube

(b)    increasing the radius of the capillary tube

(c) increasing the height of water in the vessel

(d) None of these

Ans: (a)

19 The property of a fluid by which it resists relative motion within itself is known as

(a) cohesive force

(b) surface tension

(c) diffusion

(d) viscosity

Ans: (d)

20 The powder clings to the skin because of

(a) cohesion

(b) adhesion

(c) capillary action

(d) absorption

Ans: (b)

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