RRB Junior Engineer (JE) Sample Paper: General Awareness (General Science)-29

1. What is heat ?

(a) Heat is a substance called caloric which flows from heavy body to a light body.
(b) Heat is a energy that flows from a high temperature body to a low temperature body.
(c) Heat is a motion that passes from a moving body to a stationary body.
(d) Heat is a field passing from high potential body to a low potential body.

2. One of the following thermometers, which can be used for increasing a rapidly changing temperature is a

(a) thermo-couple thermometer
(b) gas thermometer
(c) platinum resistance thermometer
(d) vapour pressure thermometer

3. The thermometer suitable to measure 2000°C is

(a) gas thermometer
(b) mercury thermometer
(c) vapour pressure thermometer
(d) total radiation pyrometer

4. A ring-shaped piece of metal is heated. If the material expands, the hole will :

(a) expand
(b) contract
(c) expand or contract depending on the width of the ring
(d) expand or contract depending on the value of the coefficient of expansion

5. Two blocks of ice when pressed together join to form one block because

(a) of heat produced during pressing
(b) of cold produced during pressing
(c) melting point of ice decreases with the increase of pressure
(d) melting point of ice increases with increase in pressure

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1(b), 2(a), 3(d), 4(a), 5(c)