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What is impulse equal to?

Solution: Impulse is the change in linear momentum and it is a vector quantity. Impulse is the measure of total effect of a force. Impulse =... View Article

How cyclones are formed in nature?

Cyclone is caused by atmospheric disturbances around a low-pressure area and is usually accompanied by violent storms and severe weather... View Article

A ray of light moves from a rare medium to a dense medium as shown in the diagram below. The ray or rays which represents the partially reflected ray is:

Ray 1 is incident ray, ray 3 is the refracted ray and ray 2 is the partially reflected ray.... View Article

What is the subjective property of sound related to its Frequency

Pitch. The sensation of frequencies is commonly referred to as the pitch of a sound. A high pitch sound corresponds to a high frequency sound... View Article

Two advantages of using a right-angled prism as a reflector, rather than a plane

A total reflecting prism is a right-angled prism made of glass with other two angles each equal to 45 degrees. There is no absorption of light... View Article

The angle between force and displacement for i) Minimum Work and ii) Maximum Work should be

Minimum work Maximum work The angle between force and displacement should be θ = 90° for minimum work. The angle between force and... View Article

For a step-up transformer______________

Answer: For a step-up transformer, the number of turns in the secondary coil is more than that in the primary coil In a step-up transformer,... View Article

Which of the following statements about the mass and weight of an object is false?

Mass is a measure of the amount of matter present in an object and therefore, it is always constant. However, the weight of an object varies as... View Article

State and explain the law of inertia.

Law of Inertia states that a body in a state of rest or uniform motion remains in the same state until and unless an external force acts on it.... View Article

Change in effect of a force can be experienced in which of the following cases?

Let us consider an example of throwing a stone. Magnitude of force applied in throwing the stone decides how far the stone will go but the... View Article

Name a safety device which is used to limit the current in an electrical circuit. The use of this device safeguards the circuit and the appliances connected in that circuit from being damaged

Fuse wire is a safety device which is used to limit the current in an electrical circuit. Fuse wire is used as a safety wire which is connected... View Article

Calculate the EMF of the given circuit

Consider a circuit with a potential difference of 5 V, with a current of 2 A flowing and the internal resistance of the battery at 0.8 ohms.... View Article

The interaction between earth and moon which keeps the moon revolving around earth can be named as a

The interaction between us and earth which binds us together is the force of gravity. Force of gravity or gravitational force is simply a kind of... View Article

Velocity of an object can be changed by altering

Velocity is a vector quantity. Therefore, change in any of the direction or magnitude or both would result in a change of velocity. The... View Article

The change of state of motion of an object can be described as

When a volleyball player smashes a ball, he changes the speed as well as direction of the ball. This is a change of state of motion. However, a... View Article

Suppose you are assigned to stop a block which is moving eastwards, a force of some magnitude is surely required to stop it. What could be the best possible direction of a force to stop that moving block from motion at the earliest?

Answer: Since the block is moving eastwards, so a force of certain magnitude acting westwards would be the best possible direction to stop the... View Article

The slope of a straight line graph gives the:

The slope of a straight line graph gives the rate of change of quantity taken on y-axis with the quantity taken on x-axis.... View Article

Which of the following instrument has the least count of 0.01 mm in general.

A) Screw gauge B) Vernier calliper C) Thermometer D) None of the above The correct option is A) Screw gauge. The least count of screw gauge... View Article

A radio wave has a maximum magnetic field induction of 10^-4 T on arrival at a receiving antenna. The maximum electric field intensity of such a wave is? (1) Zero (2) 3 × 10⁴ V/m (3) 5.8 × 10^-9 V/m (3) 3.3 × 10^-13 V/m

Answer: (2) 3 × 104 V/m Given E0 = cB0 c = 3 × 108 B0 = 10-4 E0 = 3 × 108 × 10-4 E0 = 3 × 10 4 Vm–1... View Article

Whenever the magnetic flux () linked with a coil changes the emf is induced in the circuit, This emf lasts

as long as the change in flux continues.... View Article

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