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

Copy and complete the following ray diagram.

Copy and complete the following ray diagram.

An erect, magnified, and a virtual image is formed when an object is placed between the optical centre and principal focus of a lens.
(i) Name the lens.
(ii) Draw a ray diagram to show the formation of the image with the above-stated characteristics.

An object AB is placed between 2F₁ and F₁ on the principal axis of a convex lens as shown in the diagram. Copy the diagram and using three rays starting from point A, obtain the image of the object formed by the lens.

What is a magnifying glass (or a simple microscope)? Draw a ray diagram to show how a convex lens may be used as a magnifying glass. Where should the object be placed? State three characteristics of the image formed.

(i) Draw a ray diagram to show how the lens can be used as a ‘magnifying glass’? State the nature of the lens.
(ii) In what respect does the image in (i) above different from the image formed by a concave lens?

The above picture shows a mother pushing her daughter sitting on a swing. The swing is going through the positions A, B, C where A and C are extreme positions and B is the mean position.

1. Which is the right position i.e. at A, B or C, for the mother to give a constant periodic push to the swing every time in the forward direction to increase the amplitude of the swing?  (1)
2. Name the phenomenon involved in this.  (1)
3. Explain with this example how this phenomenon helps to increase the amplitude of the swing.  (2)

Write an expression for the magnifying power of a simple microscope. How can it be increased?

1 kg of ice at 0°C is heated at a constant rate and its temperature is recorded after every 30 s till steam is formed at 100°C. Draw a temperature-time graph to represent the change of phases.

State two uses of magnifying glass.

State Faraday’s laws of electromagnetic induction.

State Lenz’s Law.

An enemy plane is at a distance of 300 km from a radar. In how much time the radar will be able to detect the plane? Take velocity of radio waves as 3 x 10⁸ ms^-1

Name the factor that determines Loudness of the sound heard.

Name the factor that determines Quality of the note

Name the factor that determines Pitch of the note.

Name the phenomenon that causes a loud sound when the stem of a vibrating tuning fork is kept pressed on the surface of a table.

The ratio of the amplitudes of two waves is 3 : 4. What is the ratio of their loudness?

The ratio of the amplitude of two waves is 3 : 4. What is the ratio of their Frequencies?

What is an echo