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To every action there is an equal and opposite reaction is the statement of:

To every action there is an equal and opposite reaction is the statement of Sir Isaac Newton. and this is the third law of motion. The other two... View Article

When can two bodies exert force on one another?

It is not always necessary that two bodies can exert force on one another only when they are in contact. They can be separated by any distance.... View Article

Which among the following is true as per Newton’s third law:

Action and reaction forces are always equal and opposite.... View Article

The momentum of a body of given mass is proportional to:

Momentum is directly proportional to the mass and the velocity of the body.... View Article

Momentum of a body of mass 0.5 kg moving with a speed of 10 m/s is

As momentum = p = mv.Thus, we get p = 0.5 × 10 = 5 kg.m/s... View Article

The law of conservation of momentum states that the sum of momenta of two objects before collision is equal to the sum of momenta after the collision provided that ______

For law of conservation of momentum, system must be isolated i.e no external unbalanced force acts on them.... View Article

For a body starting from rest and moving with uniform acceleration, the ratio of the distances covered for 1s, 2s, 3s, ….. is

We know that, s = ut + (1/2) at2If u = 0 and a is uniform; s is directly proportional to t2... View Article

According to Maxwell’s hypothesis, a changing electric field gives rise to

According to the Maxwell’s EM theory, the EM waves propagation contains electric and magnetic field vibration in mutually perpendicular... View Article

How does the speed of electromagnetic wave in vacuum depend upon the source of radiation?

The speed of EM waves in vacuum is a constant ( approx. 3 x 108 m/s).... View Article

Which of the following represents an infrared wavelength

Wave length of infrared rays fall under the range ... View Article

A liquid surface always tends to have minimum surface area due to the property of

Due to the property of surface tension a liquid surface always tends to have minimum surface area.... View Article

SI unit of surface tension is

SI unit of surface tension is Newton per metre. The CGS unit of surface tension is dyne per centimetre. Surface tension is defined as the ratio... View Article

Which of the following factor will not affect the value of angle of contact?

The angle of contact does not depend on the pressure of the liquid. ... View Article

When the salt is added to water, what happens to the surface tension of the liquid?

If the solute is highly soluble, the surface tension of liquid increases. Surface tension could be defined as the property of the surface of a... View Article

The liquid that does not wet the solid surface has an ______ angle of contact.

When liquid molecules are attracted strongly to themselves and weakly to those of solids, it costs lots of energy to create liquid-solid surface... View Article

Angle of contact of water proofing agent are generally

Water proofing agents are added to create a large angle of contact between the water and fibers so that water does not penetrate them.... View Article

At what angle should a projectile with initial velocity ‘v’ be thrown, so that it achieves its maximum range?

For maximum horizontal rangeHmax= (u2sin2θ)/2g = (u2)/2g, implying the angle should be equal to 45°..... View Article

Choose the correct answer

The maximum horizontal range is obtained when _____. Answer: Option 2 = Explanation: The horizontal range is given by the... View Article

Which of the following is not a projectile? (1) An aircraft taking off (2) A ball is thrown horizontally from a roof (3) A bullet fired from a rifle (4) A football kicked by a player.

Answer: (1) An aircraft taking off Any object thrown into space with only gravity acting on it is referred to as a projectile. Gravity is the... View Article

When a projectile is thrown up at an angle θ to the ground, the time taken by it to rise and to fall are related as

Time to rise is equal to time of fall.... View Article

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