# Railway Physics Quiz for RRB ALP Exam |RRB | 22nd December 2018

Get daily topic-wise Railway Quiz Questions and answers for various RRB exams like NTPC, JE, ALP, Group C and D. Free section-wise Indian railway quiz for RRB Exam.

Q1. If the Earth stops rotating, the apparent value of g on its surface will

(a) increases at some places and remain the same at other places

(b) increases everywhere

(c) decreases everywhere

(d) remain the same everywhere

Q2. The shape of our Milky way galaxy is

(a) circular

(b) elliptical

(c) spiral

(d) None of these

Q3. In the Earth, the weight of a body is maximum at the

(a) North pole

(b) South pole

(c) equator

(d) center of the earth

Q4. When a running car stops suddenly, the passengers tends to lean forward because of

(a) centrifugal force

(b) inertia of rest

(c) inertia of motion

(d) gravitation force

Q5.The working of a rocket is based on the principle of

(a) conservation of momentum

(b) conservation of mass

(c) conservation of energy

(d) conservation of angular momentum

Q6. When the motion of a body is confined to only one plane, the motion is said to be

(a) Plane motion

(b) Rectilinear motion

(c) Curvilinear Motion

(d) None of the mentioned

Q7. When a particle moves along a straight path, then the particle has

(a) Tangential acceleration only

(b) Centripetal acceleration only

(c) Both tangential and centripetal acceleration

(d) None of the mentioned

Q8.Theory that ‘all object falling under gravity accelerate at same constant rate’ was discovered by

(a)  Albert Einstein

(b)  Robert Hooke

(c)  sir Isaac Newton

(d)  Galileo Galilei

Q9. Candela is the unit of

(a) Magnetic flux

(b) Intensity of electric field

(c) Luminous intensity

(d) Charge

Q10. Boltzman’s constant and planck’s constant differ in the dimensions of

(a) Time and temperature

(b) Mass and temperature

(c) Length and mass

(d) Length and time

Table of Contents

## Solutions

Ans.1.(a)

Exp. The effect of rotation of earth on g, appears every where but not on poles. So, if earth stops rotating the values of ‘g’ will remain same at poles and increase at other places.

Ans.2.(c)

Exp. The shape of our milky way galaxy is spiral of 100000 –120000 light-years in diameter having 200-400 billion stars. Our solar system is contained into the milky-way galaxy.

This name has been derived from its appearance as a dim milky glowing band arching across the night sky, in which the individual stars cannot be distinguished by the naked eye.

Ans.3.(d)

Exp. According to the Newton’s law of gravitation, the weight ‘w’ of the body is given by

w = mg

Where, g is the acceleration due to gravity which equals

Where M and R are the mass and radius of the Earth respectively.  As the weight of the body is directly proportional to g. Thus, the weight of the body would be maximum at the centre of the earth.

Ans.4.(c)

Exp. According to the Newton’s first law of motion we know that the inertia of motion is that property of that uniformly moving body due to which it resists a change in its state of uniform motion.

Therefore, the passengers of a running car lean forward when that car stops suddenly.

Ans5.(a)

Exp. The working of a rocket is based on the principle of conservation of momentum as in the absence of external forces, the total momentum of the system remains conserved.

here. just before launching, the momentum of the rocket is zero and the rocket is fired it forces a jet of hot gases with a high velocity.

Ans.6.(a)

Exp.When the motion of a body is confined to only one plane, the motion is said to be plane motion. The plane motion may be either rectilinear or curvilinear.

Ans.7.(a)

Exp.When a particle moves along a straight path, then the radius of curvature is infinitely great. This means that v2/r is zero. In other words, there will be no normal or radial or centripetal acceleration. Therefore, the particle has only tangential acceleration.

Ans.8.(d)

Exp. It is a remarkable fact, first discovered over 300 years ago by Galileo and others, that objects in free fall motion descend at the same rate, independent of their mass, as long as the effects of air resistance can be neglected.

Ans.9.(c)

Exp. The candela is the base unit of luminous intensity in the International System of Units (SI).

Ans.10.(a)

Exp. Boltzman’s constant and planck’s constant differ in the dimensions of Time and temperature.

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