Question

3.Friction is a/an

a.Evil

b.Necessity

c.Both a and b

d.None of these

4.The shape of an aeroplane is like a

a. Bird

b.Car

c.Dog

d. All

5. Force acting on an object may change

a.Direction

b.Shape

c.Speed

All of these

6.Friction is a

a.Contact force

b.Non contact force

c.Magnetic force

d.None of these

7.Which force always oppose motion?

a.Magnetic force

b.Electric force

c.Friction force

d.Muscular force

8. The highest grade of coal is known as -

a. Lignite

b. Bituminous

c. Anthracite

d. Peat

9. Coke and coal tar are obtained from

a. Petroleum

b. Coal

c. Natural gas

d. Diesel

10. Which of the following is a renewable source of energy?

a. Tidal energy

b. Coal

c. Diesel

d. Petrol

11. Which petroleum product is used for coating the underside of electric pole?

a. Paraffine wax

b. Asphalt

c. Petroleum gas

d. Kerosene

12. Which fossil fuel is the base ingredient in the manufacture of fertilisers and chemicals?

a. Coal

b. Petroleum

c .Natural gas

d. Coal gas

13. Which fossil fuel is the largest source of energy used for the generation of electricity?

a. Coal

b. Petroleum

c. Natural gas

d. Diesel

14. The nucleus is separated from the cytoplasm by the –

(a)Cytoplasm

(b) Cell membrane

(c)Nuclear membrane

Protoplasm

15. Powerhouse of the cell

(a)Ribosome

(b) Mitochondria

(c)Vacuole

(d)Plastid

16 Rust of wheat is caused by –

(a)Fungus

(b) Virus

(c)bacteria

(d)protozoa

17. Which of the following reproduce only inside a host cell?

(a)Virus

(b) Protozoa

(c) Algae

(d)Bacteria

18. The thread - like structure present in the nucleus are –

(a)Genes

(b) Ribosome

(c)Nucleolus

(d) Chromosome

19. The process that helps milk to last longer but does not kill all microbes present in it is known as –

(a)Vaccination

(b) Pasteruization

(c) Bioangmentation

(d) Fermentation

20. Fungus that causes food poisoning –

(a)Clostridium

(b)Aspergillus

(c) Rhizobium

(d) Staphylococci​

Answer 1

Answer:

3.c

4.a

5.all of these

6.b

7.c

8.b

9.a

10.a

11.b