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Quiz 5
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Q.1
The sky appears blue because of
Atmospheric water vapour
Scattering of light
Reflection on sea water
Emision of blue wavelength by the sun
Q.2
The law of conservation of energy states that
Energy can neither be created nor destroyed
Energy can either be created nor destroyed
Energy can neither be created or destroyed
Energy can either be created or destroyed
Q.3
What property of matter is momentum related to?
Mass
Velocity
Both A & B
None of the above
Q.4
The swing of a spinning cricket ball in air can be explained on the basis of
Sudden change in wind direction.
Buoyancy of air.
Turbulence caused by wind.
Bernoulli's theorem.
Q.5
A rubber ball is dropped from a height of 2 metres. To what height will it rise if there is no loss of energy/velocity after rebounding ?
4 metres
3 metres
2 metres
1 metre
Q.6
A piece of paper and a cricket ball are dropped from the same height. Under which of the following conditions do both reach the surface simultaneously ?
They must have the same volume
They must have the same density
They must have the same mass
They must be dropped in vacuum
Q.7
Two stones of unequal masses are thrown vertically up with the same velocity. Which of the following will happen?
The heavier mass will reach greater height
The lighter mass will reach greater height
Both will reach the same height
Any of them may reach greater height
Q.8
The dimension of which of the following is the same as that of impulse ?
Volume
Momentum
Torque
Change in the rate of momentum
Q.9
The dimension MLT
–2
corresponds to
Force
Work done
Acceleration
Velocity
Q.10
If lift is going up with acceleration, the apparent weight of a body is
May be more or less than true weight
More than the true weight
Less than the true weight
Equal to the true weight
Q.11
Dynamo is a device for converting
Heat energy into electrical energy
Mechanical energy into electrical energy
Magnetic energy into electrical energy
Chemical energy into electrical energy
Q.12
The force that keeps a body in a circular motion called
The centripetal force
The centrifugual force
The frictional force
All the above
Q.13
It is easier to carry two buckets of water in one hand each, than to carry only one in one hand because
Weights of buckets are balanced
Centre of gravity falls within the body
Centre of gravity and centre of equilibrium fall within the feet
Resultant weight of buckets is zero
Q.14
If an electron and a photon have the same wavelength, then they will have the same
Velocity
Linear momentum
Angular momentum
Energy
Q.15
When the Sun is near the horizon during the morning or evening, it appears reddish. The phenomenon that is responsible for this observation is
Reflection of light
Refraction of light
Dispersion of light
Scattering of light
Q.16
Which combination of colour is the most convenient during day and night time ?
Organe and blue
White and black
Yellow and blue
Red and green
Q.17
During washing of clothes, we use indigo due to its
Better cleaning action
Proper pigmental composition
High glorious nature
Very low cost
Q.18
Which colour has the highest frequency?
Violet
Red
Indigo
Green
Q.19
Light scattering takes place in
Colloidal solutions
Acidic solutions
Electrolyte solutions
Basic solutions
Q.20
A hunter on the ground wishes to shoot a bird on a tree at a distance with his rifle. He has to point the rifle
At the lower elevation than the bird
At a higher elevation than the bird
In the same direction as the bird
Vertically upwards
Q.21
What will happen if an object is dropped from a height and there is no air resistance?
It will fall with a constant speed and acceleration
Its acceleration will increase
Both speed and acceleration will increase
Its speed will increase
Q.22
Angle of friction and angle of repose are
Equal to each other
Not equal to each other
Proportional to each other
None of the above
Q.23
The term ''Higgs Boson' is associated with
Nano Technology
Oncology
God Particle
Stem Cell Research
Q.24
An object covers distance which is directly proportional to the square of the time. Its accelaration is
Increasing
Decreasing
Zero
Constant
Q.25
A bullet of mass 10gm is fired with a velocity of 40 m/s from a gun of mass 8 kg. Find the recoil velocity (in m/s) of the gun.
2
0.1
4
0.05
Q.26
A man stands on the pan of a balance holding a fish in his right hand and bucket of water in his left hand. If he transfers the fish into the bucket, the total weight on the pan
Increases
Decreases
Remains the same
First increases and then decreases
Q.27
The force that generates wind is
Gravity force
Pressure gradient force
Coriolis force
Centrifugal force
Q.28
When all the forces and torques are balanced in a mechanical body it is said to be in
Equilibrium
Static
Buoyancy
None of the above
Q.29
Centrifugal force increases with
Temperature
Pressure
Acceleration
Humidity
Q.30
A disk and a sphere of same radius but different masses roll on two inclined planes of the same altitude and length. Which one of the two objects gets to the bottom of the plane first ?
Depends on their masses
Sphere
Disk
Both reach at the same time
Q.31
The washing machine works on the principle of
Dialysis
Diffusion
Reverse osmosis
Centrifugation
Q.32
The working of a rocket is based on the principle of:
Conservation of momentum
Conservation of mass
Conservation of energy
Conservation of angular momentum
Q.33
A bomb at rest explodes into a large number of tiny fragments. The total momentum of all the fragments
Is zero
Depends on the total mass of all the fragments
Depends on the speeds of various fragments
Is infinity
Q.34
A ball is thrown vertically upward from the ground. It crosses a point at the height of 25 m twice at an interval of 4 seconds. The ball was thrown with the velocity of
18 m/s
25 m/s
30 m/s
36 m/s
Q.35
The point where total mass of a body is supposed to be concentrated is known as
Dead centre
Centre of mass
Centre of gravity
Centre of motion
Q.36
The angle in which a cricket ball should be hit to travel maximum horizontal distance is :
60° with horizontal
45° with horizontal
30° with horizontal
15° with horizontal
Q.37
Rain drops fall from great height. Which among the following statements is true regarding it?
They fall with that ultimate velocity, which are different for different droplets
They fall with same ultimate velocity
Their velocity increases and they fall with different velocity on the earth
Their velocity increases and they fall with same velocity on the earth
Q.38
The splitting of different colours of light in a prism is :
Reflection of light
Disperson of light
Diffraction of light
Refraction of light
Q.39
A boy is swinging a ball attached to a string in a horizontal circle. If the string snaps
The ball will travel towards the center of the circle and fall down
It will continue to travel along a tangent to the circle at the point the ball was at the time of snapping and finally fall down
It will fall down at the same place where the string breaks
None of these
Q.40
A body moving in a circular path with a constant speed has a
Constant velocity
Constant acceleration
Constant kinetic energy
Constant displacement
Q.41
What is the direction of torque?
Perpendicular to the direction of applied force
Same as the direction of applied force
Opposite to the direction of applied force
Parallel to the radius
Q.42
Ball pen functions on the principle of :
Viscosity
Boyle's Law
Gravitational force
Surface tension
Q.43
What is the SI unit of Power?
Boyle
Watt
Newton
Pascal
Q.44
A boy sitting in a train moving with a uniform velocity drops a coin outside. A man standing outside the train will find the trajectory of the coin to be
A parabola
A circle
A horizontal straight line
A vertical straight line
Q.45
The minimum number of forces to keep a particle in equilibrium is
1
2
3
4
Q.46
When milk is churned, the cream separates from it due to:
Frictional force
Centrifugal force
Gravitational force
Viscous forces
Q.47
When an unbalanced force acts on an object
Causes change in motion of the object
The speed & direction of the object will change
Causes the object to move
All of the above
Q.48
What type of force acts on a car moving around a curve?
Centrifugal force
Cohesive force
Centripetal force
Gravitational force
Q.49
What factors contribute to global winds?
Coriolis Effect
Convection Cells
Uneven warming of the earth by the sun
All of the above
Q.50
Tensional forces normally cause which one of the following?
Normal faults
Strike-slip faults
Thrust faults
Reverse faults
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