Integrated Science

Question 1

1Which form of energy does a stretched catapult store?

Easy

A. chemical energy B. elastic potential energy C. nuclear energy D. sound energy

Question 2

2A force of 20 N acts on a 4 kg mass. What is the acceleration?

Easy

A. 80 m/s² B. 5 m/s² C. 0.2 m/s² D. 24 m/s²

Question 3

3The organ of balance is in the

Easy

A. tongue B. eye C. inner ear D. nose

Question 4

4Crop rotation helps to

Easy

A. increase soil erosion B. reduce yields C. maintain soil fertility and control pests D. pollute rivers

Question 5

5What is the formula of magnesium oxide?

Easy

A. Mg₂O₃ B. Mg₂O C. MgO D. MgO₂

Question 6

6A sudden change in the genetic material of a cell is

Easy

A. pollination B. a variation by environment C. fertilisation D. a mutation

Question 7

7The process by which nitrogen gas in the air is changed into nitrates in the soil by bacteria is

Medium

A. ammonification B. denitrification C. transpiration D. nitrogen fixation

Question 8

8A sample of lemon juice has a pH of 3. The juice is

Easy

A. neutral B. weakly alkaline C. strongly alkaline D. acidic

Question 9

9A solar panel of area 2 m² receives 800 W/m² and is 15% efficient. Its electrical output is

Hard

A. 240 W B. 800 W C. 120 W D. 1,600 W

Question 10

10A machine has efficiency 75% and velocity ratio 8. What effort lifts a load of 600 N?

Hard

A. 100 N B. 150 N C. 75 N D. 80 N

Question 11

11Salting fish helps to preserve it because

Easy

A. salt draws water out of microbes by osmosis, so they cannot grow B. salt kills only flies C. salt adds vitamins D. salt cooks the fish

Question 12

12A body of mass 10 kg is lifted through a height of 2 m. Calculate the potential energy gained. (g = 10 m/s²)

Easy

A. 200 J B. 2000 J C. 20 J D. 100 J

Question 13

13The lungs excrete

Easy

A. urea B. bile pigments C. excess salt D. carbon dioxide and water vapour

Question 14

14The first stage in the germination of a seed is the uptake of water called

Medium

A. osmosis only B. transpiration C. pollination D. imbibition

Question 15

15LED stands for

Easy

A. light-emitting diode B. long electron diode C. light electric detector D. low-energy device

Question 16

16Diffusion is faster at higher temperatures because particles

Easy

A. become heavier B. move faster C. stop moving D. get bigger

Question 17

17The tiny blood vessels where exchange of materials takes place are

Easy

A. arteries B. capillaries C. veins D. aorta

Question 18

18An acid turns blue litmus paper

Easy

A. red B. green C. yellow D. blue

Question 19

19Which is a renewable source of energy?

Easy

A. natural gas B. wind C. coal D. petrol

Question 20

20The part of the brain responsible for thinking and memory is the

Easy

A. cerebrum B. medulla C. cerebellum D. spinal cord