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

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.

A lens of power +2·5D is kept in contact with another lens of power -2·5D. Draw the path of a ray passing through the lens combination.

Explain the meaning of the term terminal voltage of a cell.

State the principle of an electric motor.

What is electromagnetic induction?

At what voltage is this current available to our household?

What happens to the resistivity of semiconductor with the increase of temperature?

A cell of Emf 2 V and internal resistance 1.2 Ω is connected with an ammeter of resistance 0.8 Ω and two resistors of 4.5 Ω and 9 Ω as shown in the diagram below:

1) What would be the reading on the Ammeter?

2) What is the potential difference across the terminals of the cell?