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#### Question A.1:

Which of the following is not a transparent substance?
(a) Glass
(b) Water
(c) Air
(d) Wax paper

(d) Wax paper

Wax paper is translucent.

#### Question A.2:

Which of the following is an insulator?
(a) Silver
(b) Pure water
(c) Human body
(d) Acids

(b) Pure water

Pure water is an insulator. Impure water is a conductor of electricity.

#### Question A.3:

Motion in a straight line is called a
(a) circular motion
(b) rectilinear motion
(c) periodic motion
(d) none

(b) rectilinear motion

Motion in a straight line is called rectilinear motion.

#### Question A.4:

The distance between the tip of the middle finger and the elbow is called a
(a) cubit
(b) fathom
(c) hand span
(d) stride

(a) cubit

The cubit is an ancient unit of length. One cubit is the distance between the tip of the middle finger and the elbow.

#### Question A.5:

Which of the following is not a unicellular organism?
(a) Amoeba
(b) Paramecium
(c) Earthworm
(d) Yeast

(c) Earthworm

An earthworm is a multicellular organism.

#### Question B:

Fill in the blanks:
1. The term centi means ........................... part of a unit.
2. A highly polished metal surface or still water acts as a ........................... .
3. Plants living in water are called ........................... .
4. The glow-worm is a ........................... source of light.
5. Cells and batteries are the sources of ........................... .

1. The term centi means one-hundredth part of a unit.
2. A highly polished metal surface or still water acts as a reflector.
3. Plants living in water are called hydrophytes.
4. The glow-worm is a luminous source of light.
5. Cells and batteries are the sources of electricity.

#### Question C:

Match the columns:

 Column A Column B 1. Temperature (a) Battery 2. Toad (b) Xerophytes 3. Combination of cells (c) Hydrophytes 4. Euphorbia (d) Kelvin 5. Vallisneria (e) Amphibian

 Column A Column B 1. Temperature (d) Kelvin 2. Toad (e) Amphibian 3. Combination of cells (a) Battery 4. Euphorbiaâ€‹ (b) Xerophytes 5. Vallisneria (c) Hydrophytes

#### Question D:

Write true (T) or false (F):
1. Electric bulbs and gas lamps are natural sources of light. ( )
2. Tungsten is used to make bulb filament. ( )
3. Insulators do not allow electric current to pass through them. ( )
4. Living organisms are made up of cells. ( )
5. Gram is the SI unit of mass. ( )

1. False (F)

Electric bulbs and gas lamps are artificial sources of light.

2. True (T)

3. True (T)

4. True (T)

5. False (F)

The SI unit of mass is the kilogram.

#### Question E:

Write the names of the following:
1. Plants and animals consisting of many cells. ..................................
2. Movement of animals from one place to another. ..................................
3. Plants that grow in deserts or very dry places. ..................................
4. Motion in which a body moves along the circumference of a circle. ...................................
5. Continuous change of position of a body with respect to another ...................................
6. Bodies which give out light of their own. ...................................
7. Substances through which light can pass partially. ...................................
8. Substances which do not allow electricity to pass through them. ...................................
9. The closed path in which electric current flows. ...................................
10. An electric device that easily closes or opens an electric circuit. ...................................

1. Multicellular

2. Locomotion

3. Xerophytes

4. Circular motion

5. Relative motion

6. Luminous

7. Translucent

8. Insulators

9. Circuit

10. Switch

#### Question F:

Match these words with correct pictures given below:
Rectilinear motion  Amoeba Xerophyte  Circular motion

Figure

(a) Xerophyte

(b) Circular motion

(c) Amoeba

(d) Rectilinear motion

#### Question G.1:

How do cacti adapt to survive in a desert?

Cacti have the following adaptations that help them to survive in a desert.
1. The cactus plant has an extensive root system with numerous root hairs that go deep into the soil in search of water.
2. The leaves are modified into spines and coated with a cuticle to prevent the loss of water through transpiration.
3. The stomata are few, sunken in pits.
4. The stem is thick and fleshy for conserving water.

#### Question G.2:

Distinguish between rest and motion.

 Rest Motion A body is said to be at rest when it does not change its position with respect to a reference stationary object. A body is said to be in motion when it changes its position with respect to a reference stationary object.

#### Question G.3:

What do you mean by reflection of light?

The reflection of light is a phenomenon in which a light beam changes its direction or is reflected when it hits a polished surface such as a mirror.

#### Question G.4:

What is the difference between a cell and a battery?

 Cell Battery A cell cannot be recharged. A battery can be recharged. It is also called a primary cell. It is also called a secondary cell or storage cell.

#### Question H.1:

Write about different characteristics of living things.

The following are the characteristics of living things.
1.They are made up of cells.
2. They are sensitive.
3. They need food to live.
4. They respire.
5. They excrete.
6. They have a definite lifespan.
7. They reproduce.

#### Question H.2:

How can you measure the length of a curved line?

You can measure the length of a curved line using a string. First, draw a curved line on your notebook. Then, fix a string on one end of the curved line. Thereafter, place the string on the drawn line. Using your fingers and thumbs, stretch the string along the curved line tightly until you reach the other end of the line. Remove the string and measure its length using a metre scale. The measurement gives the length of the curved line.

#### Question H.3:

Give the principle, construction and working of a pinhole camera.

Principle: A pinhole camera is based on the principle of the rectilinear propagation of light.

Construction: A pinhole camera consists of a rectangular light-proof box with a very small hole in the middle of one face and a shutter arrangement to open and close the hole. A photographic plate is placed on the opposite side of the hole.

Working: When light rays from an object pass through the fine hole, they form a small, real and inverted image on the screen. The sharpness and size of the image can be altered by adjusting the distance of the object from the hole.

#### Question H.4:

Draw a circuit diagram to show flow of current through an electrical circuit with three cells, a switch, and an electric bulb.