Q.1
Gasoline is useful in cars because it has
Q.2
Sun appears red in colour at sunrise and sunset due to
Q.3
1 Joule is Equal to
Q.4
Which one of the following instruments is used to study dispersion of light ?
Q.5
Rainbows are produced when sunlight :
Q.6
If the velocity of a body is halved its kinetic energy ________
Q.7
Solar energy is converted into chemical energy during
Q.8
Danger signals are generally red as red light
Q.9
In radio-communication, the signals emitted by transmitting antenna are reflected on
Q.10
Kinetic energy depends on
Q.11
The device used to convert solar energy into electricity is
Q.12
A mass of 20 kg is at a height of 8 m above the ground. Then the potential energy possessed by the body is: [Given g = 9.8 m/s2]
Q.13
Why does the sea appear blue in colour?
Q.14
Refractive Index of glass with respect to water is
Q.15
A person lifts luggage of 20 kg from the ground and puts it on his head 2m above the ground. Calculate the work done by him. (g = 10 )
Q.16
Electric Motor converts ________ energy to mechanical energy
Q.17
Total number of colours exists in sunlight
Q.18
When white light passes through a glass prism we get a spectrum on the other side of the prism. In the emergent beam the ray which is deviated least is
Q.19
A dynamo is a device which
Q.20
Which one of the following is responsible for the working of Newton's colour disc experiment ?
Q.21
Mist is caused by
Q.22
Red light is used for signals because it has
Q.23
The splitting of white light into its components is due to:
Q.24
In which of the following cases, kinetic energy is being used in performing work ?
Q.25
A cyclist leans inwards when he is negotiating a curve so that
Q.26
A thin oil film on a water surface appears coloured because of
Q.27
Velocitation is the tendency to
Q.28
Skids occur when the brakes are applied so hard that the front or rear wheels lose traction are called as
Q.29
A dynamo is used to convert
Q.30
An object which absorbs all colours and reflects none appears:
Q.31
Microphone is a device which transforms the
Q.32
Which colour is the complementary colour of yellow ?
Q.33
Which of the following is used to split white light into different colours ?
Q.34
If an object is thrown upwards, what will be its velocity, when it reaches its maximum height?
Q.35
The blue colour of sky is due to
Q.36
If the velocity-time graph of a particle is represented by y = mt + c, then the particle is moving with
Q.37
Which one of the following is applicable to collision-coalescence process of precipitation?
Q.38
During the motion of a projectile fired from the earth surface, ________
Q.39
Force of impact is the force
Q.40
A man standing at the top of a tower has two spheres A and B. He drops sphere A downwards and throws sphere B horizontally at the same time. Which of the following is correct ?
Q.41
The quantity that is not conserved in an inelastic collision is
Q.42
A photo-electric cell converts
Q.43
What is the change in the angular momentum of a system as per the Law of Conservation of Angular momentum, if the total external torque acting is zero?
Q.44
Conversion of heat into electrical energy is achieved by using :
Q.45
In sunlight a rose appears red. In green light, the same rose appears
Q.46
The sky appears blue because
Q.47
What colour does blue and yellow make?
Q.48
Knot is a measure of
Q.49
A pilot has to release the bomb to hit a target
Q.50
The phenomenon of light associated with the appearance of blue colour of the sky is
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