Questions with Answer Railway
1. A thermometer with an arbitrary scale has ice point at-10° and steam point at 140°. If the temperature measured by this thermometer is 20° The corresponding reading on the Celsius scale will be
a. 13.3° C
b. 20° C
c. 30° C
d. 45° C
ans (c)
2. Which of the following is not a part of an external combustion engine?
a. Cylinder
b. Spark plug
c. Boiler
d. Piston
ans (b)
3. In thr propagation of sound waves in air, the angle between the direction of vibration of air molecules and direction of wave propagation.
a. is 0°
b. varies between -90° to 90^
c. varies between 0° to 90°
d. is 90°
ans (b)
4. What will happen if some charge is given to a soap bubble?
a. Its size decreases.
b. Its size increases.
c. Its size remains the same.
d. It collapses.
ans (b)
5. A solid body of density 0.5 g/cc floats on a liquid of density 0.9 g/cc. The fraction of solid volume above the liquid surface is
a. 4/9
b. 5/9
c. 2/3
d. Zero
ans (b)
6. Raindrops are spherical due to
a. viscosity of water
b. surface tension
c. continuous evaporation
d. air friction
ans (b)
7. When two mercury drops are brought into contact they merge to form a bigger drop become liquids have a tendency to possess.
(a) minimum volume
(b) maximum surface area
(c) minimum surface area
(d) maximum volume
ans (c)
8.On a clean glass plate a drop of water spreads to form a thin layer whereas a drop of mercury remains almost spherical because
(a) mercury is a metal
(b) density of mercury is greater than that of water
(c) cohesion of mercury is greater than its adhesion with glass
(d) none of these
ans (c)
9. In a sprayer the liquid rises in the tube due to
(a) capillarity
(b) evaporation
(c) lower pressure at the upper end
(d) none of these
ans (c)
10. When a cube of ice floating on water in a beaker melts the level of water in the beaker
(a) rises
(b) falls
(c) remains the same
(d) first rises and then falls
ans (c)
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