(English Medium) ICSE Class 10 - CISCE Question Bank Solutions for Physics

In what way does the temperature of water at the bottom of a waterfall differ from the temperature at the top? Explain the reason.

State the condition under which the mechanical energy is conserved.

A body falls freely under gravity from rest. Name the kind of energy it will possess while falling.

Show that the sum of kinetic energy and potential energy (i.e., total mechanical energy) is always conserved in the case of a freely falling body under gravity (with air resistance neglected) from a height h by finding it when

1. The body is at the top.
2. the body has fallen a distance x.
3. the body has reached the ground.

A ball of mass 0.20 kg is thrown vertically upwards with an initial velocity of 20 m s^-1. Calculate the maximum potential energy it gains as it goes up.

A pendulum is oscillating on either side of its rest position. The correct statement is: 

A stone of mass 500 g is thrown vertically upwards with a velocity of 15 m/s. Calculate:

1. the potential energy at the greatest height,
2. the kinetic energy on reaching the ground, and
3. the total energy at its half-way point.

A metal ball of mass 2 kg is allowed to fall freely from rest from a height of 5 m above the ground. Taking g = 10 m s⁻², calculate:

1. the potential energy possessed by the ball when it is initially at rest.
2. the kinetic energy of the ball just before it hits the ground?

What is the difference between potential energy and kinetic energy?

Name the factors on which the heat produced in a wire depends when current is passed in it, and state how does it depend on the factors stated by you.

(a) Observe the diagram given below and state whether the bulb will glow or not when we switch on K.

(b) Is it safe to handle the bulb when the switch is OFF?

(c) Give a reason for your answer in (b).

When a current I flows through a wire of resistance R for time t then the electrical energy produced is given by ______.

The graph of voltage vs current for four different materials is shown below.

Which of these four materials would be used for making filament of bulb?

A body of mass 10 kg falls from a height of 20 m to 8 m. Calculate:

1. the loss in potential energy of the body, and
2. the total energy possessed by the body at any instant? (Take g = 10 m s^-2)

An electric iron is rated 220 V, 2 kW. If the iron is used for 3h daily find the cost of running it for one week if it costs ₹ 4.25 per kWh.

State the energy changes in the following case while in use:

An electric iron

State the energy changes in the following case while in use:

A ceiling fan

Energy can exist in several forms and may change from one form to another. State the energy changes that occur in the unwinding of a watch spring.

Energy can exist in several forms and may change from one form to another. State the energy changes that occur in a loaded truck when started and set in motion.

Energy can exist in several forms and may change from one form to another. State the energy changes that occur in a car going uphill.