(English Medium) ICSE Class 10 - CISCE Important Questions for Physics

A door lock is opened by turning the lever (handle) of length 0.2 m. If the moment of force produced is 1 Nm, then the minimum force required is ______.

When a stone tied to a string is rotated in a horizontal plane, the tension in the string provides ______ force necessary for circular motion.

A non uniform beam of weight 120 N pivoted at one end is shown in the diagram below. Calculate the value of F to keep the beam in equilibrium.

A hollow ice cream cone has height 6 cm.

1. Where is the position of its center of gravity from the broad base?
2. Will its position change when it is filled completely with honey? Write Yes or No.

Why is a jack screw provided with a long arm?

If the power of a motor is 100 kW, at what speed can it raise a load of 50,000 N?

A boy weighing 40 kgf climbs up a stair of 30 steps each 20 cm high in 4 minutes and a girl weighing 30 kgf does the same in 3 minutes. Compare:

1. The work done by them.
2. The power developed by them.

A stone of mass m is rotated in a circular path with a uniform speed by tying a strong string with the help of your hand. Answer the following questions

1) Is the stone moving with a uniform or variable speed?

2) Is the stone moving with a uniform acceleration? In which direction does the acceleration act?

3) What kind of force acts on the hand and state its direction?

When a body is placed on a table top, it exerts a force equal to its weight downwards on the table top but does not move or fall

1) Name the force exerted by the table top

2) What is the direction of the force?

How is work done by a force measured when the force is in the direction of displacement?

How is work done by a force measured when the force is in an angle to the direction of displacement?

Rajan exerts a force of 150 N in pulling a cart at a constant speed of 10 m/s^-1. Calculate the power exerted.

Give the expression for mechanical advantage of an inclined plane in terms of the length of an inclined plane.

Name a common device where a gear train is used

Draw a simplified diagram of a lemon crusher, indicting of load and effort

Explain briefly why the work done by a fielder when he takes a catch in a cricket match is negative.

When does a force do work?

What is the work done by the moon when it revolves around the earth?

Calculate the change in the Kinetic energy of a moving body if its velocity is reduced to 1/3rd of the initial velocity.

State the energy change in the following device while in use:
A loudspeaker