# Physics Questions and Answers updated daily – General Knowledge

Physics Questions: Solved 254 Physics Questions and answers section with explanation for various online exam preparation, various interviews, General Knowledge Category online test. Category Questions section with detailed description, explanation will help you to master the topic.

## Physics Questions

61. A ball of mass 2kg is thrown up with a speed of 10m/s. find the kinetic energy of the ball at the time of throwing. Also find the potential energy of the ball at the highest point?

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Correct Ans:100 J
Explanation:
Here m = 2 Kg, u = 10 m/s
K = (1/2)mv2
Hence Kinetic energy at the time of throwing
K = 1/2 * 2 * 102 = 100 J
When the Ball reaches at highest point, its whole kinetic energy is converted in Potential energy.
So potential energy of the ball at the highest point = Initial Kinetic energy = 100 J
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62. Energy possessed by a body due to its position is called its

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Correct Ans:potential energy
Explanation:
Potential energy is the energy possessed by a stationary body.
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63. When a substance is heated its density ?

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Correct Ans:Decrease
Explanation:
If an iron rod is heated, it will get longer and fatter and its density will decrease. This happens because the mass of the rod stays the same, but its volume increases. The increase in the volume of matter with increasing temperature is called expansion.
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64. A piece of wood of mass 160 g and volume of 200cm3 find the density of wood in cgs system?

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Correct Ans:0.8 (g/cm3)
Explanation:
---> Mass of wood = 160gm
---> Volume of wood = 200cm3
---> Density of wood in cgs system
---> D = (m/v)
---> = (160/200)
---> = 0.8 (g/cm3)
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65. A block of metal has dimension 4cm,5cm and 25 cm and has a mass of 1.28kg find the density of the block?

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Correct Ans:2560 (kg/m3)
Explanation:
---> Mass of metal 1.28 kg
---> Volume of metal = 4*5*25 cm
---> = 500 cm3
---> = 0.0005 m3
---> = d = (m/v)
---> = (1.28 kg/ 0.0005 m3)
---> = 2560 (kg/m3)
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66. Digital stopwatches show reading upto ______.

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Correct Ans:2 decimal places
Explanation:
A stop watch shows the time reading upto 2 decimal places. Precision of most stopwatches is 0.01 second.
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67. Spring balance is used to measure ________.

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Correct Ans:Weight
Explanation:
Spring balances are commonly used to measure the force exerted on an object. This force is usually measured in Newtons and is essentially the weight of an object. The weight of an object is a measurement of its mass * gravity (w = mg).
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68. Convert 104°F into Degree Celsius.

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Correct Ans:40°C
Explanation:
Conversion Formula
°Celsius = (5/9) * (°Fahrenheit - 32)

---> 104°F = (5/9) * (104 - 32)
= (5/9) * 72
= 5 * 8
= 40°Celsius
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69. Bar is a unit of which one of the following?

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Correct Ans:Pressure
Explanation:
The bar is a unit of pressure defined as 100 kilopascals. It is about equal to the atmospheric pressure on Earth at sea level.
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70. The SI unit of mechanical power is

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Correct Ans:Watt
Explanation:
Watt is the unit of power (symbol is W). It is named after James Watt, the inventor of the steam engine. One watt is defined as the energy consumption rate of one joule per second.
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71. When two sound waves are superimposed, beats are produced when they have

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Correct Ans:different frequencies
Explanation:
When two sound waves are superimposed, beats are produced when they have different frequencies.
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72. A passenger standing in a bus is thrown outward when the bus takes a sudden turn. This happens due to

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Correct Ans:inertia of motion
Explanation:
A passenger may fall sideways, when the bus takes a sharp turn, due to centrifugal force. The bus is initially moving forward, so the passengerâ€™s inertia is also in the forward direction. Because of inertia: The passengers are going straight unless thereâ€™s a force that pushes them into another direction.
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73. In the phenomenon of dispersion of light, the light wave of shortest wavelength is

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Correct Ans:slowed down and refracted the most
Explanation:
Short wavelength is slowed down and refracted the most
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74. The major problem in harnessing nuclear energy is how to ________.

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Correct Ans:Dispose of spent fuel safely
Explanation:
The major hazard of nuclear power generation is the storage and disposal of spent or used fuels - the uranium still decaying into harmful subatomic particles (radiations). Improper nuclear-waste storage and disposal result in environmental contamination.
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75. Which of the following is not an example of a bio-mass energy source?

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Correct Ans:nuclear energy
Explanation:
Biomass is a collective term for all plant and animal material. A number of different forms of biomass can be burned or digested to produce energy. Examples of biomass include wood, straw, poultry litter and energy crops such as willow and poplar grown on short rotation coppice and miscanthus.
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76. A rocker climber climbs 63m to the top of a cliff. If the rock climber has a mass of 85kg what is the potential energy of the climber?

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Correct Ans:52479 joules
Explanation:
---> Potential energy = M*G*H
---> M = mass
---> G = gravity
---> H = height
---> = 85 * (9.8m/s2) * 63
---> = 52479 joules
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77. Conservation of momentum in a collision between particles can be understood from ________.

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Correct Ans:both Newton's second and third law
Explanation:
Conservation of momentum states that the total momentum of a system remains constant with time until unless an external force acts on the system.

The given situation states the collision between the particles which may be understood through Newton's law of motion specifically the 2nd and 3rd law.
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78. A ball is travelling with uniform translatory motion. This means that

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Correct Ans:all parts of the ball have the same velocity (magnitude and direction) and the velocity is constant.
Explanation:
In uniform translatory motion, all parts of the ball have the same velocity in magnitude and direction and this velocity is constant.
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79. Two boy pushes a table in opposite direction with equal force then

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Correct Ans:No work is to be done
Explanation:
Equal forces acting in opposite directions are called balanced forces. Balanced forces acting on an object will not change the object's motion. When you add equal forces in opposite direction, the net force is zero.
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80. Walking off a man is an example of

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Correct Ans:Resolution of forces
Explanation:
While walking, a person presses the ground with his feet slightly slanted in the backward direction. The ground exerts upon him an equal and opposite reaction. Its horizontal component enables the person to move forward while the vertical component balances
this weight.
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