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

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 ______.

Three resistors of 6.0 Ω, 2.0 Ω and 4.0 Ω are joined to an ammeter A and a cell of emf 6.0 V as shown in the following figure. Calculate :

1. the effective resistance of the circuit.
2. the reading of ammeter.

What do you mean by power rating of an electrical appliance? How do you use it to calculate 

(a) the resistance of the appliance and

(b) the safe limit of the current in it, while in use?

Why do we usually use isotopes emitting gamma radiations as radioactive tracers in medical science?

Name two main sources of nuclear radiations. How are these radiations harmful?

A given metallic wire of resistance R is doubled on itself. What will be its new resistance?

How does the resistance of an alloy, vary with temperature?

Bends in a rubber pipe reduce the flow of water through it. How would the bands in a wire affect its electric resistance?