# RRB Questions- Physics

## Previous Years’ RRB Exam Questions

Which of the following is a scalar quantity?

• Electric Field
• Average Velocity
• Power
• Magnetic Momentum

If the velocity of a body is doubled-

• Its Kinetic Energy is doubled
• Its potential Energy is doubled
• Its Momentum is doubled
• Its Acceleration is doubled

Clothes keep us warm in winter because they-

• Supply heat
• Do not rediate heat
• Prevent air from contacting the body
• Prevent the heat of the body from escaping

Permanent magnet can be made from-

• Cobalt
• Aluminum
• Zinc
• Lead

Which one of the following is the correct unit of angular velocity?

• m per minute
• cm per sec²
• cm per sec
• radians per sec

The force by which a body is attracted towards the centre of the earth is called-

• Gravitational force
• Mass
• Momentum
• Impulsive force

The maximum displacement of a vibrating body from its mean position is called-

• Gyration
• Wavelength
• Amplitude
• Impulse

The kinetic energy of a body depends upon-

• Mass, gravity and height
• Its mass alone
• Its velocity alone
• Both mass and velocity

A ball weighing 25 grams is thrown vertically into the air. It takes 15 seconds to reach its highest point. How much time would it take to reach the ground from its highest point?

• More data are required for calculation
• Less than 15 seconds
• More than 15 seconds
• 15 seconds

The term ‘Squirrel Cage’ is associated with

• Pressure gauges
• Internal combustion engines
• Potentiometers
• Electric motors

The phenomenon of increase in the temperature of the earth’s atmosphere due to absorption of the infra-red radiations reflected from the earth’s surface is called-

• Tsunami
• Solar heating
• Green-house effect
• Seismic effect

Why is it recommended that people should not use charcoal or gas stoves in closed rooms?

• The electrical wiring in the room may catch fire
• The stoves will get extinguished
• It can cause carbon monoxide poisoning
• The stoves may burst

The most effective way to improve safety in a vast organisation like the Indian Railways is to-

• Ignore small acts of negligence by the staff
• Carry out frequent checks
• Educate the staff at all levels
• Punish defaulting staff

The density of water is maximum at

• 100°C
• 0°C
• -273°C
• 4°C

Which one of the following quantities does not have a unit?

• Velocity
• Density
• Specific Gravity
• Mass

A Swimmer finds it easier to swim in sea water than in plain water. Why?

• Sea water has less contamination
• Sea waves help a swimmer to swim
• Sea water has higher density than plain water
• Sea has a much higher volume of water

Humidity refers to-

• Both temperature and moisture contents of the air
• Temperature of the air
• Moisture content of the air
• Pressure of the air

Boyle’s law states that-

• Volume is directly proportional to temperature
• Pressure is inversely proportional to temperature
• Pressure is directly proportional to temperature
• Pressure is inversely proportional to volume

Purity of milk is confirmed by-

• Barometer
• Lactometer
• Altimeter
• Gyroscope
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