# Railway Physics Quiz for RRB ALP Exam |RRB | 4th JANUARY 2019

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. Optical ﬁber works on which of the following principle of light?

(a) Reflection

(b) Refraction

(c) Diffraction

(d) Total internal reflection

Q2. Why does water tank appear shallower when viewed from the top?

(a) Due to reflection

(b) Due to refraction

(c) Due to diffraction

(d) Due to total internal reflection

Q3. Which colour is formed when Red and Green are mixed?

(a) Light blue

(b) Yellow

(c) White

(d) Grey

Q4. What is the SI unit of frequency?

(a) Newton

(b) Watt

(d) Hertz

Q5. Which one of the following is an insulator?

(a) Copper

(b) Wood

(c) Mercury

(d) Aluminium

Q6. Bubbles of air rise up through liquids due to:

(b) Viscosity and buoyancy

(c) Air current over the liquid and buoyancy

(d) Up thrust and surface tension

Q7. Which one of the following is an insulator?

(a) Copper

(b) Wood

(c) Mercury

(d) Aluminum

Q8. Formula for distance is –

(a) Speed x time

(b) Time / speed

(c) Speed x acceleration

(d) Velocity / speed

Q9. What is the fundamental unit of amount of a substance?

(a) Mole

(b) Candela

(c) Kelvin

(d) Meter

Q10. Arithmometer was invented by –

(a) Evangelista Torricelli

(b) Charles Xavier Thomas

(c) Edward Teller

(d) Charles Babbage

## Solution

Ans.1.(d)

Exp. Optical fibre work on the principle of Total Internal Reflection of Light. In optical fibre, when light traveling in an optically dense medium hits a boundary at a steep angle (larger than the critical angle for the boundary), the light is completely reflected. This is called total internal reflection.

Ans.2.(b)

Exp. Water Tank appears shallower when viewed from the top due to refraction of light. This virtual depth is known as apparent depth.

Ans.3.(b)

Exp. Yellow colour is formed when Red and Green are mixed.

Ans.4.(d)

Exp. The SI unit of frequency is the hertz (Hz),  named after the German physicist Heinrich Hertz; one hertz means that an event repeats once per second.

Ans.5.(b)

Exp. Wood is a good insulator.

Ans.6.(b)

Exp. Bubbles of air rise up through liquids due to viscosity and buoyancy.

Ans.7.(b)

Exp. Wood is an insulator.

Ans.8.(a)

Exp. Distance=Speed × Time

Ans.9.(a)

Exp. The mole is the unit of measurement for amount of substance in the International System of Units (SI). The unit is defined as the amount or sample of a chemical substance that contains as many constitutive particles.

Ans.10.(b)

Exp. The Arithmometer was the first digital mechanical calculator strong enough and reliable enough to be used daily in an office environment. It was invented by Charles Xavier Thomas.

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