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

Name the following substances:
(i) Showing low resistivity,
(ii) Showing very high resistivity,
(iii) Showing moderate resistivity.

What potential difference is needed to drive a current o f 1 A through a 5 Ω resistor?

What is the equivalent resistance between A and B in the given circuit (Fig?)

How will you oonnect five resistors, each of the value one ohm, to obtain an equivalent resistance of 0.2 `Omega`

You have three resistors of values 2 `Omega`, 3 `Omega`, and 5 `Omega`. How will you join them so that the total resistance is less than 2 `Omega`?

Calculate the equivalent resistance of the following combination of resistor r₁, r₂, r₃, and r₄

What information about the nature of image is real or virtual, do you get from the sign of magnification + or -?

If the magnification produced by a lens is - 0.5, the correct statement is ______.

The focal length of a convex lens is 25 cm. At what distance from the optical centre of the lens an object be placed to obtain a virtual image of twice the size?

An illuminated object lies at a distance 1.0 m from a screen. A convex lens is used to form the image of the object on a screen placed at a distance of 75 cm from the lens. Find:

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

An object is placed at a distance of 20 cm in front of a concave lens of focal length 20 cm. find: the magnification of image.

The magnification by a lens is -3. Name the lens and state how are u and v related?

The magnification by a lens is +0.5. Name the lens and state how are u and v related?

The maximum magnifying power of a convex lens of focal length 5 cm can be ______.