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

A metal wire of resistance 6 Ω is stretched so that its length is increased to twice its original length. Calculate its new resistance.

Calculate the quantity of heat that will be produced in a coil of resistance 75 Ω if a current of 2A is passed through it for 2 minutes.

Two wires of same material and same lengths have radii in the ratio of 2 : 3, Compare their resistances.

Two resistors having 2Ω and 3Ω resistance are connected—(i) in series, and (ii) in parallel. Find the equivalent resistance in each case.

The resistance of two resistors joined in series is 8Ω and in parallel is 1.5Ω. Find the value of the two resistances.

What are conjugate foci?

Define the term magnifying power of a simple microscope. How does it depend on the focal length of the lens used?

Name the lens used as a magnifying glass.

Why is the focal length of the lens, used as a magnifying glass, kept short?

Will the image formed by a magnifying glass be real or virtual?

What information we seek by the linear magnification of the image when it is positive or negative?

Define magnification produced by a lens. State its unit.

Name the lens for which magnification can be 1. For what position of the object will the magnification be 1?

Name the lens for which magnification is always less than 1.

A convex lens produces on a screen an image twice the size of the object. If the position of image and object be interchanged, what will be the magnification then?

How is the magnification (m) produced by a lens related to the object distance (u) and the image distance (v)?

An object is placed in front of a lens between its optical centre and the focus and forms a virtual, erect, and diminished image. Draw a ray diagram to show the formation of the image with the above-stated characteristics.

Show with the help of a ray diagram, the path of the ray when incident normally on the first surface of the glass block, through the block and the liquid.

Draw a neat diagram to explain the action of a convergent (convex) lens as a reading glass (or magnifying glass). State the characteristics of the image formed.

What is a simple microscope or a magnifying glass? Draw a ray diagram to show its function.