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The device used for producing electric current is called _________.
Concept: Electromagnetic Induction
Write any three properties of magnetic lines of force.
Concept: The Bar Magnet
Name the following diagram and explain the concept behind it.
Concept: Electromagnetic Induction
Given below is a diagram showing a defect of human eye. Study it and answer the following questions.
(i) Name the defect shown in the figure.
(ii) Give reason for this defect of eye in human being.
(iii) Name the type of lens used to correct the eye defect.
Concept: Eye Defect and Its Correction: Myopia Or Near-sightedness
Draw a neat and labelled diagram of the structure of the human eye.
Concept: Human Eye
Complete the following table for convex lens:
| Sr. No. | Position of the object | Position of the image | Nature of the image |
| 1. | Beyond 2F1 | __________________ | ________________________ |
| 2. | __________________ | At infinity | ________________________ |
| 3. | __________________ | __________________ | Real, inverted and enlarged |
Concept: Images Formed by Sperical Lenses
What is refraction of light?
Concept: Introduction to Refraction of Light
Give a scientific reason:
Danger signals are red in colour.
Concept: Some Natural Phenomena Due to Sunlight
Fill in the blank:
Very fine particles mainly scatter ………… colored light.
Concept: Some Natural Phenomena Due to Sunlight
Choose the correct alternative and rewrite the following sentence.
A ray of light strikes the glass slab at an angle of 50°. What is the angle of incidence?
Concept: Refraction of Light Through a Rectangular Glass Slab
Choose the correct alternative and rewrite the following sentence.
A ray of light strikes the glass slab at an angle of 50°. What is the angle of incidence?
Concept: Refraction of Light Through a Rectangular Glass Slab
Draw the diagram of refraction of light in the glass slab
Concept: Refraction of Light Through a Rectangular Glass Slab
Draw the diagram of refraction of light in the glass slab
Concept: Refraction of Light Through a Rectangular Glass Slab
Match the Columns:
| Column ‘A’ | Column ‘B’ |
| Refractive index of water | (a) 1.31 |
| (b) 1.36 | |
| (c) 1.33 |
Concept: Refractive Index
Explain the role of citizen in pollution control.
Concept: Abatement of Pollution
An object takes 5 s to reach the ground from a height of 5 m on a planet. What is the value of g on the planet?
Concept: Acceleration Due to Gravity (Earth’s Gravitational Acceleration)
The radius of planet A is half the radius of planet B. If the mass of A is MA, what must be the mass of B so that the value of g on B is half that of its value on A?
Concept: Acceleration Due to Gravity (Earth’s Gravitational Acceleration)
What will be the weight of a person on earth, who weighs 9N on the moon?
Concept: Free Fall
A ball falls off a table and reaches the ground in 1 s. Assuming g=10 m/s2, calculate its speed on reaching the ground and the height of the table.
Concept: Free Fall
