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1. Ozone layer which absorbs harmful solar UV radiation is found in which layer of the atmosphere?

A

Troposphere

B

Stratosphere

C

Mesosphere

D

Ionosphere

2. Choose the INCORRECT statement from the following

A

The main constituent of bio gas is ethane

B

Gobber gas is produced when crops, vegetable wastes etc., decompose in the absence of oxygen.

C

Bio mass is a renewable source of energy

D

Planting more trees is encouraged to ensure clean environment

3. In a biotic community, the primary consumers are

A

Carnivores

B

Detritivores

C

Herbivores

D

Omnivores

4. The processes of adding sulphur to rubber is called

A

Pulverisation

B

Vulcanisation

C

Sulphurisation

D

Stablisation

5. If the current in a circuit equals 0 A, it is likely that the

A

Resistance is too low

B

Voltage is too high

C

Circuit is open

D

Circuit is closed

6. Most of the energy produced during respiration is stored in

A

Pyruvic acid

B

Carbon dioxide

C

Adenosine triphosphate

D

Adenosine monophosphate

7. Calcium deficiency in the body occurs in the absence of

A

Vitamin C

B

Vitamin D

C

Vitamin B

D

Vitamin K

8. Which one of the following physical quantities of an object is specified by its speed and direction?

A

Time

B

Acceleration

C

Mass

D

Velocity

9. The most common material used in making solar cells is

A

Silver

B

Iron

C

Aluminum

D

Silicon

10. Little leaf is caused due to the deficiency of

A

Boron

B

Copper

C

Zinc

D

Phosphorus

11. Which one of the following is responsible for diseases such as Cholera, Typhoid and Jaundice?

A

Heat

B

Air Pollution

C

Water Pollution

D

Food Items

12. A light ray will retrace its path after reflection for a spherical mirror when it passes through

A

focus

B

vertex

C

centre of curvature

D

pole

13. Biogas is a type of biofuel that is naturally produced from the decomposition of organic waste. Its main constituents are:

A

Oxygen and Nitrogen

B

Methane and Carbon Dioxide

C

Argon and Helium

D

Hydrogen and Xenon

14. An enclosure that sits atop the wind turbine and contains the gear box, low speed shaft and high-speed shaft, generator, controller, and brake is called

A

Rotor

B

Nacelle

C

Generator

D

Controller

15. The negative magnitude of magnification indicates that the image is

A

Virtual and erect

B

real and errect

C

real and inverted

D

virtual and inverted

16. The phenomenon of splitting of white light into different colours is called

A

scattering

B

dispersion

C

reflection

D

deviation

17. The near point of a hypermetropic eye is 1m. The power of the lens required to correct this defect is

A

1D

B

2D

C

3D

D

4D

18. The normal loss of near focusing ability that occurs with age is known as

A

Myopia

B

Presbyopia

C

Hypermetropia

D

Astigmatism

19. For nearby objects, eye lens is contracted and squeezed into a more convex shape by

A

Sclera

B

fovea

C

Ciliary muscles

D

pupil

20. Which of the following is a secondary fuel?

A

Coal

B

Crude Oil

C

Natural Gas

D

Gasoline