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

Illustrate-combination of cells e.g., three cells, in parallel, explaining the combination briefly. Obtain an expression for current ‘i’ in the combination.

Two resistors of 4Ω and 6Ω are connected in parallel to a cell to draw 0.5 A current from the cell.
Draw a labelled circuit diagram showing the above arrangement.

Two resistors of 4Ω and 6Ω are connected in parallel to a cell to draw 0.5 A current from the cell. Calculate the current in each resistor.

What should be the length of a nickel wire of area of cross-section 3 mm² used for making a rheostat of 750 ohm? (ρ of nickle = 0.069 Ohm mm²/m)

Calculate the value of the resistance which must be connected to a 15 ohm resistance to provide on effective resistance of 6 ohm.

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?