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A kilowatt-hour is unit of
Ventilators are provided near the ceiling of the room because
The hair of shaving brush clings together when removed from water due to
In the process of magnetisation of a bar
A falling drop of rain water acquires the spherical shape due to
The weakest of all fundamental forces is
Velocity of sound in air does not change with the change of
Nano technology deals with objects with dimensions in the range of
Why is it difficult to breathe at higher altitudes?
The strongest force in nature is
According to the theory of relativity, which of the following always remains constant?
The spoon dropped by an astronaut in a satellite will
A colour-blind person cannot
Pipelines in cold countries often burst in winter, because
When a body is taken from earth to moon
A mirage occurs because of
Atomic power plant works on the principle of
Bolometer is used to measure
A person is hurt on kicking a stone due to
The fuse in our domestic electric circuit melts when there is a high rise in
Which of the following is an example for cantilever beam?
It is difficult to cook rice
A dynamo is a device which
A soap bubble shows colours when illuminated with white light. This is due to
The instrument used to see the distant objects on the Earth is
Which of the following substance is highly plastic?
Which of the following principle is used to produce ‘low-temperatures’?
A photo-electric cell converts
Two stones of different masses are dropped simultaneously from the top of a building
A concave lens always forms an image which is
The modulus of rigidity is the ratio of
The propagation of sound waves in a gas involves
If input frequency of a full wave rectifier be n, then output frequency would be
Heat transfer horizontally within the atmosphere is called
Noise is measured in
The bats can fly in the dark because
What changes will happen to a bowl of ice and water kept at exactly zero degree Celsius?
The acceleration due to gravity at the equator
Angle of friction and angle of repose are
If a boy sitting in a train, which is moving at a constant velocity, throws a ball straight up into the air, the ball will
Intensity of gravitational field of earth is maximum at
The spokes used in the wheel of a bicycle increase its
A transformer works on the principle of
The sky appears blue because
The device in communication satellites which receives signals from an earth station and transmits them to different directions is
When a ship enters the sea from a river
Two stones of unequal masses are thrown vertically up with the same velocity. Which of the following will happen?
The centre of gravity of a sprinter during the race lies
Cloudy nights are warmer compared nights, because clouds mainly
A metal plate with a circular hole at the centre is heated. What will happen to the area of the hole?