Which of the following is the relation between SI unit of gravitational force and Newton?
In SI system, the gravitational unit of force is kilogram – weight. It is that force which when acting on... View Article
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A person standing on a weighing scale sees a reading on the scale as 148 pounds. This person is acted on by
Two equal forces act in opposite directions.
Which of the following quantities is transferred during wave propagation?
During sound wave propagation particles vibrate at its position and energy is transferred. Particles themselves do not move from one... View Article
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... 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.... View Article
Which among the following is true as per Newton’s third law:
Action and reaction forces are always equal and opposite.
The momentum of a body of given mass is proportional to:
Momentum is directly proportional to the mass and the velocity of the body.
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
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.
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) at2 If u = 0 and a is uniform; s is directly... 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 direction.... 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).
Which of the following represents an infrared wavelength
Wave length of infrared rays fall under the range
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.
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... 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.
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... 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... 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... 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°..
