Q.1
Lightning is caused due to
Q.2
Find the current (in A) when a charge of 1200C flows in 6 seconds.
Q.3
When the main switch of the house is put off it disconnects the
Q.4
Electric power is measured in units of
Q.5
During thunderstorm you are travelling in a car. To protect yourself from the lightning you will have to
Q.6
The unit of electrical power is
Q.7
Intensity of sound has
Q.8
Rain is falling vertically downwards. To a man running east-wards, the rain will appear to be coming from
Q.9
A concave lens always forms an image which is
Q.10
Which one of the following determines the sharpness of image in a camera ?
Q.11
What is refractive index ?
Q.12
Which one of the following processes is responsible for the glittering of air bubble rising through water?
Q.13
Find the current (in A) when a charge of 500 Coulomb flows in 25 seconds.
Q.14
Safety fuse wire used in domestic electrical appliances is made of metal of low
Q.15
An aeroplane is flying horizontally with a velocity of 600 km/h and at a height of 1960 m. When it is vertically at a point A on the ground a bomb is released from it. The bomb strikes the ground at point B. The distance AB is
Q.16
Dioptre is the unit of
Q.17
The part of the eye having the largest refractive index is :
Q.18
A star appears twinkling in the sky because of
Q.19
What type of lens is used in a magnifying glass
Q.20
The absolute refractive index of any medium is always:
Q.21
Lens is made up of
Q.22
The increasing order of the refractive index of certain materials is (left to right) ________
Q.23
Which color deviates least when passing through a Prism
Q.24
Vehicles use ________ to see the objects coming from behind.
Q.25
Weight of a body is maximum at the:
Q.26
When a body is accelerated, then the velocity will be also
Q.27
The phenomenon of change in direction of light when it passes from one medium to another is called
Q.28
The refractive index of a transparent medium is maximum for
Q.29
Time of exposure required for taking photograph of an object depends upon the
Q.30
A concave lens always forms
Q.31
'Mirage' is an example of
Q.32
Mirage is due to
Q.33
Rate of change of displacement is known as ________
Q.34
When a ball is thrown vertically upwards, which of the following quantities remains constant during its motion?
Q.35
Which color deviates highest when passing through a Prism
Q.36
A pond of water appears less deep due to
Q.37
During ________ motion of an object along a straight line, the velocity remains constant with time.
Q.38
What does the slope of a velocity time graph represent?
Q.39
What type of lens is a magnifying glass?
Q.40
Which of the following is not caused by atmospheric refraction of light ?
Q.41
The motion of a freely falling body is an example of ________ accelerated motion.
Q.42
During uniform motion of an object along a straight line, its ________ remains constant with time.
Q.43
Find the acceleration (in m/s2) of a body which accelerates from 25 m/s to 30 m/s in 10 seconds
Q.44
A water tank appears shallower when it is viewed from top due to
Q.45
For a body moving with non-uniform velocity and uniform acceleration
Q.46
A man standing on a edge of a cliff throws a stone vertically upwards with a certain speed. He then throws another stone downwards with the same speed. Find the ratio of the speeds of the two stones when they hit the ground.
Q.47
As we go from Equator to North pole the value of ''g', the acceleration due to gravity
Q.48
Speed in a given direction is called
Q.49
The slope of a velocity-time graph represents
Q.50
Why does water tank appear shallower when viewed from the top?
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