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

Explain how is the principle of echo used by
(a) The bat during its flight at night,
(b) The dolphin to locate small fish as its prey.

The device used for measuring potential difference is

A current of 0.2 A flows through a wire whose ends are at a potential difference of 15 V. Calculate:
(i) The resistance of the wire, and
(ii) The heat energy produced in 1 minute.

Define the following:

Potential difference

What is the combined resistance of each of the networks between A and B shown in fig. ?

The voltage across a 3Ω resistance is 6 V. How large is the current? What is
the resistance of a filament lamp when a voltage of 3 V across it causes a
current of 0.5 A?

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. Name the kind of lens.

How will you differentiate between a convex and a concave lens by looking at  a distant object.

How will you differentiate between a convex and a concave lens by looking at a printed page?

The wavelengths of violet and red light are 4000 Å and 8000 Å respectively. Which of the two has the higher frequency?

The wavelength range of white light is ______.

A wave has wavelength 50Å of name the wave.

A wave has wavelength 50Å of State the speed in vacuum.