# Railway Physics Quiz for RRB ALP Exam |RRB | 27th 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. The magnetic needle always points in _________ direction.

(a) East – West

(b) West – South

(c) North – South

(d) North – East

Q2. What is the source of electrical energy in an artificial satellite?

(a) Solar cell

(b) Mini nuclear reactor

(c) Dynamo

(d) Thermopile

Q3. The weight of any body is

(a) same at every place on earth’s surface

(b) maximum at poles

(c) more on equator

(d) more on mountains than in planes

Q4. Transformer is used

(a) for converting AC into DC

(b) for coverting DC into AC

(c) to step up DC voltages

(d) to step up or step down AC voltages

Q5. When a body is taken from the earth to the moon

(a) its weight increases

(b) its weight decreases

(c) its weight remains unchanged

(d) it becomes completely weightless

Q6. An iron ball weighing 10 kg on the earth will weigh in space

(a) less than 10 kg

(b) more than 10 kg

(c) exactly 10 kg

(d) zero

Q7. Which of the following is the best conductor of electricity?

(a) Aluminium

(b) Copper

(c) Silver

(d) Gold

Q8. Astronauts in space can’t stand at one place, because

(a) there is no gravity

(b) viscous forces of the atmosphere are very strong

(c) solar wind expert an upward force

(d) atmospheric pressure is very low

Q9. What should be the characteristic of fuse wire?

(a) High melting point, high specific resistance

(b) Low melting point, low specific resistance

(c) High melting point, low specific resistance

(d) Low melting point, high specific resistance

Q10. The heating element of an electric heater should be made with a material, which should have

(a) high specific resistance and high melting point

(b) high specific resistance and low melting point

(c) low specific resistance and low melting point

(d) low specific resistance and high melting point

## Solution

Ans.1.(c)

Exp. The magnetic needle always points North-South direction. Where magnetic north points towards geographic south and magnetic south towards geographic north pole.

Ans.2.(a)

Exp. Most artificial satellites have solar cell to generate electricity. Batteries store some of this energy for times when the satellite is in the shadow of the earth.

Ans.3.(b)

Exp. The weight of any body is maximum at poles.

Weight = mass × acceleration due to gravity(g) g_maximum at poles and

g_minimum at equator hence weight is maximum at poles and minimum at equator.

Ans.4.(d)

Exp. A transformer is an electrical device that transfers energy from one circuit to another by magnetic coupling with no moving parts. It comprises of two or more coupled windings, or a single topped winding, and a magnetic core to concentrate magnetic flux. These are used to convert between high and low voltage, to change impedance, and to provide electrical isolation between circuits.

Ans.5.(b)

Exp. When a body is taken from the earth to the moon its weight decreases as the value of gravity on the surface of the moon is 1/6th as that of the earth’s surface.

Ans.6.(d)

Exp. An iron ball weighing 10 kg on the earth will weigh in space zero in space body experiences weightlessness as g = 0.

Ans.7.(c)

Exp. Silver is the best conductor of electricity as compared to aluminium, copper and gold.

Ans.8.(a)

Exp. Astronauts in space can’t stand at one place because there is no gravity in space. The farther one gets from Earth, the less the gravitational force is which implies that gravity is absent in space as astronauts are very far from Earth.

Ans.9.(d)

Exp. A fuse is a safety device consisting of a strip of wire that melts and breaks an electric circuit if the current exceeds the safe value. Characteristics of a fuse wire are that if should have low melting point, high specific resistance, low ohmic losses, should be economical and free from detraction.

Ans.10.(a)

Exp. The working of heating elements is based on heating effect of electric current. When a current is passed through a resistance, it produces heat. The required properties in material used for heating elements is high melting point, high specific resistance, high tensile strength, low temperature coefficient of resistance, high ductility. Mostly nichrome wire is used as a heating element because it is very stable even at high temperatures.

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