1.

What is the physical state of water at 25⁰C

1-mark

2.

C.N.G. stands for ………

1-mark

3.

What do you mean by the term ‘motion’

1-mark

4.

What is the displacement, if a body moves from A to B along a circular path as shown in figure.

1-mark

5.

Who discovered cell?

1-mark

6.

Which organelle is known as power house of the cell?

1-mark

7.

Convert                           
(i) 573 K in to Celsius scale
(ii) 100⁰C in to Kelvin scale

2-marks

8.

Why does the water kept in an earthen pot become cool during summer?

2-marks

9.

An object travels 16m in 4s and then another 32m in 4s. What is the average speed of the object?

2-marks

10.

A bus decreases its speed form 80km/hr to 60 km/h in 5 seconds. Find the acceleration of the bus?

2-marks

11.

Why is the plasma membrane called a selectively permeable membrane?

2-marks

12.

Why are lysosomes known as suicide bags?

2-marks

13.

What type of clothes should be wear in summer and why?

3-marks

14.

What produce more severe burns, boiling water or steam? Justify your answer.

3-marks

15.

Prove graphically?

3-marks

16.

A ball is gently dropped from a height of 20 m. If its velocity increases uniformly at the rate of 10   ms^-2 , with what velocity will it strike the ground?

3-marks

17.

Draw a neat and labelled diagram of plant cell or Typical animal cell.

3-marks

18.

Give the functions of following cell organelles (Any three)
(i) Golgi apparatus    (ii) Vacoules    (iii) Chloroplasts    (iv)Endoplasmic reticulum

 3-marks

19.

Tick the correct answer :-        
(i)Which of the following is matter
(a) Air        (b) Love        (c) Cold        (d) Smell

(ii) Displacement
(a) It cannot be zero    (b)It is can be zero
(c)It is always negative     (d) None of above

(iii) The longest cell of human body is
(a)Blood cell    (b) Fat cell     (c)Nerve cell    (d) Muscles cell

(iv) The Structural and functional unit of life is
(a)Tissue    (b)Oxygen and water     (c) Water only        (d) Cells