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Quiz 25
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Q.1
Lightning is caused due to
Electric power
Electric discharge
Electric leak
Electric pressure
Q.2
Find the current (in A) when a charge of 1200C flows in 6 seconds.
7200
200
100
3600
Q.3
When the main switch of the house is put off it disconnects the
Live wire only
Live wire and the earth wire
Live wire and the neutral wire
Earth wire and the neutral wire
Q.4
Electric power is measured in units of
Volt
Joule
Watt
Ampere
Q.5
During thunderstorm you are travelling in a car. To protect yourself from the lightning you will have to
Remain in the car
Get out of the car and lie flat in the ground
Abandon the car and take shelter under a nearby tree
Touch the nearest electric pole
Q.6
The unit of electrical power is
Bolt
Watt
Kilowatt hour
Ampere
Q.7
Intensity of sound has
an object existence
a subject existence
no existence
both subjective and objective existence
Q.8
Rain is falling vertically downwards. To a man running east-wards, the rain will appear to be coming from
east
west
northeast
southeast
Q.9
A concave lens always forms an image which is
Real and erect
Virtual and erect
Real and inverted
Virtual and inverted
Q.10
Which one of the following determines the sharpness of image in a camera ?
The aperture
The exposure time
The focal length of the lens
Size of the camera
Q.11
What is refractive index ?
It is defined as the ratio of speed of light in the medium to the speed of light in vacuum.
It is defined as the product of speed of light in medium and in vacuum.
It is defined as the ratio of speed of light in vacuum to the speed of light in the medium.
None of above
Q.12
Which one of the following processes is responsible for the glittering of air bubble rising through water?
Reflection of light
Refraction of light
Total internal reflection of light
Scattering of light
Q.13
Find the current (in A) when a charge of 500 Coulomb flows in 25 seconds.
12500
20
40
6250
Q.14
Safety fuse wire used in domestic electrical appliances is made of metal of low
Resistance
Melting point
Specific gravity
Conductance
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
1200 m
0.33 km
3.33 km
33 km
Q.16
Dioptre is the unit of
Power of a lens
Focal length of a lens
Light intensity
Sound intensity
Q.17
The part of the eye having the largest refractive index is :
Cornea
Aqueous humor
Lens
Vitreous humor
Q.18
A star appears twinkling in the sky because of
Scattering of light by atmosphere
Reflection of light by atmosphere
Refraction of light by atmosphere
Diffraction of light by atmosphere
Q.19
What type of lens is used in a magnifying glass
Concave
Plano-concave
Convex
None of the above
Q.20
The absolute refractive index of any medium is always:
More than one
0
1
Less than one
Q.21
Lens is made up of
Pyrex glass
Flint glass
Ordinary glass
Cobalt glass
Q.22
The increasing order of the refractive index of certain materials is (left to right) ________
Rocksalt, Benzene, Kerosene, Ice
Rock Salt, Ice, Benzene, Kerosene
Ice, Kerosene, Benzene, Rock Salt
Kerosene, Ice, Benzene, Rock Salt
Q.23
Which color deviates least when passing through a Prism
Blue
Green
Yellow
Red
Q.24
Vehicles use ________ to see the objects coming from behind.
Concave lens
Convex lens
Convex mirror
Concave mirror
Q.25
Weight of a body is maximum at the:
Equator
Pole
Subtropics
Tropics
Q.26
When a body is accelerated, then the velocity will be also
Increase
Decrease
Constant
None of the above
Q.27
The phenomenon of change in direction of light when it passes from one medium to another is called
Propagation
Reflection
Refraction
Dispersion
Q.28
The refractive index of a transparent medium is maximum for
Red light
Violet light
Yellow light
Green light
Q.29
Time of exposure required for taking photograph of an object depends upon the
Brightness of the object
Skill of photographer
Proximity of object
Size of the object
Q.30
A concave lens always forms
A real image
A virtual image
An image type which depends on object characteristics
An image type which depends on lens curvature
Q.31
'Mirage' is an example of
Refraction of light only
Total internal reflection of light only
Refraction and total internal reflection of light
Dispersion of light only
Q.32
Mirage is due to
Magnetic disturbances in the atmosphere
Equal heating of different parts of the atmosphere
Unequal heating of different parts of the atmosphere
Depletion of ozone layer in the atmosphere
Q.33
Rate of change of displacement is known as ________
Acceleration
Velocity
Speed
Distance
Q.34
When a ball is thrown vertically upwards, which of the following quantities remains constant during its motion?
Energy
Displacement
Velocity
Acceleration
Q.35
Which color deviates highest when passing through a Prism
Indigo
Green
Violet
Orange
Q.36
A pond of water appears less deep due to
Reflection
Diffraction
Refraction
Polarisation
Q.37
During ________ motion of an object along a straight line, the velocity remains constant with time.
Linear
Translational
Uniform
Equilibrium
Q.38
What does the slope of a velocity time graph represent?
Acceleration
Distance
Speed
Momentum
Q.39
What type of lens is a magnifying glass?
Diverging
Spherical
Converging
Achromatic
Q.40
Which of the following is not caused by atmospheric refraction of light ?
Sun appearing red at sunset
Twinkling of stars at night
Sun appearing higher in the sky than it actually is
Sun becoming visible two or three minutes before actual sunrise
Q.41
The motion of a freely falling body is an example of ________ accelerated motion.
Non-uniformly
Uniformly
Uniquely
Specially
Q.42
During uniform motion of an object along a straight line, its ________ remains constant with time.
Acceleration
Deceleration
Force
Velocity
Q.43
Find the acceleration (in m/s
2
) of a body which accelerates from 25 m/s to 30 m/s in 10 seconds
5.5
1
11
0.5
Q.44
A water tank appears shallower when it is viewed from top due to
Rectilinear propagation of light
Reflection
Total internal reflection
Refraction
Q.45
For a body moving with non-uniform velocity and uniform acceleration
Displacement – Time graph is linear
Displacement – Time graph is non-linear
Velocity – Time graph is nonlinear
Velocity – Time graph is linear
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.
1 : 1
1 : 2
1 : 4
Cannot be found from the given information.
Q.47
As we go from Equator to North pole the value of ''g', the acceleration due to gravity
Remains the same
Decreases
Increases
None of the above
Q.48
Speed in a given direction is called
Velocity
Torque
Acceleration
Displacement
Q.49
The slope of a velocity-time graph represents
Acceleration
Displacement
Distance
Speed
Q.50
Why does water tank appear shallower when viewed from the top?
Due to reflection
Due to refraction
Due to diffraction
Due to total internal reflection
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