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Mayank1444
@mayank1444
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Joined: Oct 11, 2021
Last seen: Nov 14, 2021
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Answer to: What type of wave is represented: (a) by density-distance graph? (b) by displacement-distance graph?

(a) Longitudinal wave (b) Transverse wave

4 years ago
Forum
Sound
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Answer to: What is the SI unit of frequency?

Hertz is the SI unit of frequency.

4 years ago
Forum
Sound
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Answer to: Name the physical quantity whose SI unit is ‘hertz’.

Frequency

4 years ago
Forum
Sound
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Answer to: Which of the following cannot transmit sound? Water, vacuum, aluminium, oxygen gas

Vacuum

4 years ago
Forum
Sound
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Answer to: Name one solid, one liquid, and one gas through which sound can travel.

Solid: table Liquid: water Gas: air

4 years ago
Forum
Sound
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Answer to: Name the type of waves which are used by astronauts to communicate with one another on moon.

Astronauts use radio waves for communications.

4 years ago
Forum
Sound
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Answer to: Can sound travel through vacuum?

No, sound cannot travel through vacuum.

4 years ago
Forum
Sound
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Answer to: Can sound travel through (a) iron (b) water?

Sound can travel through both iron as well as water.

4 years ago
Forum
Sound
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Answer to: A stone is thrown upwards as shown in the diagram. When it reaches P, which of the following has the greatest value for the stone?

Correct answer is: (c) its potential energy

4 years ago
Forum
Work, Power And Energy
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Answer to: Which of the following does not possess the ability to do work not because of motion?

Correct answer is: (c) a sparrow in the nest on a tree

4 years ago
Forum
Work, Power And Energy
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Answer to: A girl weighing 400 N climbs a vertical ladder. If the value of g be 10 m/s^2, the work done by her after climbing 2 m will be

Correct answer is: (b) 800 J

4 years ago
Forum
Work, Power And Energy
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Answer to: Each of the following statements describes a force acting. Which force is causing work to be done?

Correct answer is: (b) the pull of a moving railway engine on its coaches

4 years ago
Forum
Work, Power And Energy
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Answer to: The momentum of a bullet of mass 20g fired from a gun is 10 kg.m/s. The kinetic energy of this bullet in kJ will be

Correct answer is: (c) 2.5

4 years ago
Forum
Work, Power And Energy
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Answer to: Water stored in a dam possesses (a) no energy (b) electrical energy (c) kinetic energy (d) potential energy

Correct answer is: (d) potential energy

4 years ago
Forum
Work, Power And Energy
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Answer to: The work done on an object does not depend on the

Correct answer is: (d) initial velocity of the object

4 years ago
Forum
Work, Power And Energy
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Answer to: A girl is carrying a school bag of 3 kg mass on her back and moves 200 m on a levelled road. If the value of g be 10 m/s^2, the work done by the girl

Correct answer is: (c) 0 J

4 years ago
Forum
Work, Power And Energy
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Answer to: An iron sphere of mass 10 kg has the same diameter as an aluminium sphere of mass 3.5 kg, Both the spheres are dropped simultaneously from a tower.

Correct answer is: (a) acceleration

4 years ago
Forum
Work, Power And Energy
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Answer to: In case of negative work, the angle between the force and displacement is

Correct answer is: (d) 180°

4 years ago
Forum
Work, Power And Energy
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Answer to: A car is accelerated on a levelled road and attains a speed of 4 times its initial speed. In this process, the kinetic energy of the car

Correct answer is: (d) becomes 16 times that of initial kinetic energy

4 years ago
Forum
Work, Power And Energy
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Answer to: A car is accelerated on a levelled road and acquires a velocity 4 times of its initial velocity. During this process, the potential energy of the car:

Correct answer is (a) does not change

4 years ago
Forum
Work, Power And Energy
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