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1. The phytochemical smog is formed by

A

Nitrous ozonides

B

Hydrocarbons

C

Nitrogen peroxides and hydrocarbons

D

Solar radiations upon nitrogen oxides and hydrocarbons

2. Cryogenics is

A

a type of tank

B

study of materials and phenomena at low temperature

C

study of radioactive elements

D

none of the above

3. The basic functional unit of the Kidney is

A

Pyramid

B

Henley`s loop

C

Nephron

D

Nephridia

4. What is the pH of blood?

A

7.4

B

2.4

C

11

D

14

5. Identify the versatile organ from the facts given below :
i) It is the largest organ in human body.
ii) It is sensor packed with nerves for keeping the brain in touch with the outside world.
iii) It manufactures vitamin D for converting calcium into healthy bones.
iv) It the body`s largest waste removal system

A

The Skin

B

The Liver

C

The Intestine

D

The Heart

6. Match the following names of the electro magnetic waves given in list-i with the technological applications given in list-ii
Radio Waves ---- Sterilize Medical Equipment
Gamma Rays ---- Navigation and Air Traffic Control
X-Rays ---- Airpost Scanner

A

a-1 b-2 c-3

B

a-3 b-1 c-2

C

a-2 b-1 c-3

D

a-2 b-3 c-1

7. The heat received by a person sitting in front of a fire is due to which of the following mode(s) of heat of transfer?
i) Conduction
ii) Convection
iii) Radiation

A

only i and iii

B

ii only

C

iii only

D

only i and ii

8. Which of the following options is used as disinfectant to disinfect the Personal Protective Equipments (PPE) used by sanitation workers?

A

Sodium Hypochlorite

B

Calcium Carbonate

C

Sodium Benzoate

D

Sodium Bicarbonate

9. Vitamins are substances that our body needs to grow and develop normally. The deficiency of vitamin K leads to

A

Excessive bleeding due to injury

B

Poor Vision

C

Swollen feet or legs

D

Retarded Growth

10. German Silver is an alloy of which of the following metals?

A

Aluminium and Tin

B

Copper and Silver

C

Iron , Silver and Tin

D

Copper, Zinc and Nickel

11. In which of the following options is the chemical compound and tis common name INCORRECTLY matched?

A

Sodium Bicarbonate ----> Baking Soda

B

Nitrous Oxide ----> Laughing Gas

C

Calcium Carbonate ----> Limestone

D

Sodium Hydroxide ----> Washing Soda

12. Which of the following statements is FALSE with reference to the digestive system processes in human beings?

A

Digestion is the breakdown of food into simpler form

B

Ingestion is the intake of food through the mouth

C

Egestion is the removal of digested food from the body

D

Absorption is the release of nutrients from food into the blood stream

13. Vitamins are substances that our body needs to grow and develop normally. The vitamin prepared in our body with the help of sunlight is

A

Vitamin D

B

Vitamin A

C

Vitamin K

D

Vitamin E

14. The most commonly used bleaching agent for disinfecting drinking water supply is

A

Phenyl

B

Chlorine

C

Alcohol

D

Distilled Water

15. Water pollution occurs when harmful substances like microorganisms contaminate a water body degrading the water quality and rendering it toxic to humans or the environment. Which of the following diseases in NOT due to contamination of water?

A

Malaria

B

Tuberculosis

C

Cholera

D

Typhoid

16. Identify the INCORRECT match between the element and its corresponding chemical symbol

A

Calcium - Ca

B

Aluminium - Al

C

Sodium - So

D

Chlorine - Cl

17. The act of transferring pollen grains from the male anther of a flower to the female stigma is called

A

Photosynthesis

B

Polarization

C

Pollination

D

Polymerisation

18. Which of the following options is matched INCORRECTLY?

A

Fuel cell - Chemical energy is converted into Electrical energy

B

Loud Speaker - Sound energy is converted into Electrical energy

C

Photovoltaic cell - Light energy is converted into Electrical energy

D

Electric motor - Electrical energy is converted into Mechanical Energy

19. Which of the following characteristic(s) of a sound wave determine the loudness of the sound?
i) Frequency
ii) Amplitude
iii) Timbre

A

only i and ii

B

only iii

C

only ii

D

only i and iii

20. The Ozone gas found in which of the following layers of the atmosphere absorbs harmful UV radiations and prevents them from reaching the earth`s surface?

A

Troposphere

B

Stratosphere

C

Mesosphere

D

Thermosphere