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

Compare the magnitudes of centripetal and centrifugal force.

State two differences between the centripetal and centrifugal force.

A boy experiences a centrifugal force on his hand when he rotates a piece of stone tied at one end of a string, holding the other end in the hand.

The centrifugal force is ______.

Write the lens formula explaining the meaning of the symbols used.

The correct lens formula is ______.

1. At what position a candle of length 3 cm be placed in front of a convex lens so that its image of length 6 cm be obtained on a screen placed at distance 30 cm behind the lens?
2. What is the focal length of lens in part (a)?

A concave lens forms the image of an object kept at a distance 20 cm in front of it, at a distance 10 cm on the side of the object.

1. What is the nature of the image?
2. Find the focal length of the lens.

Where should an object be placed in front of a convex lens of focal length 0.12 m to obtain a real image of size three times the size of the object, on the screen?

A lens forms the image of an object placed at a distance of 45 cm from it on a screen placed at a distance 90 cm on the other side of it. Find:

1. the focal length of lens,
2. the magnification of the image.

What is an electric motor?

Resonance is ______.

Choose the correct relation for e.m.f. (ε) and terminal voltage V:

A convex lens of focal length 10 cm is placed at a distance of 60 cm from a screen. How far from the lens should an object be placed so as to obtain a real image on the screen?

We are able to see the T.V. channels clearly when we set T.V. on auto-tuning.

1. Which phenomemon led to the clear visibility of the channels, due to auto-tuning?
2. Define the above phenomenon mentioned by you.
3. Give any one more example of this phenomenon.

Find the value of current I drawn from the cell.

1. Calculate the current I.
2. Calculate the terminal voltage.

The diagram below shows a cardboard on which iron filings are kept. A wire bent in the form of a loop is seen passing through the cardboard. When current flows through it, the iron filings arrange themselves as shown below.

1. State the polarities of the battery at A and B.
2. State the effect on the magnetic field if an iron rod is held along the axis of the coil.
3. State one way to:
   1. Change the polarity of the coil.
   2. Decrease the strength of the magnetic field around the coil.

The potential difference between terminals of a cell in a closed electric circuit is ______.

State two factors affecting the coil's rotation speed in a D.C. motor.

The image of a candle flame placed at a distance of 36 cm from a spherical lens, is formed on a screen placed at a distance of 72 cm from the lens. Calculate the focal length of the lens and its power.