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Medieval Indian History - 1
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1. How many times does the heat beat approxiamtely in a minute in humans ?

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Correct : D
Explanation: In a normal man, the average heart beat is 72 times per minute.

2. Teeth and Bones acquire strength and rigidity from

Correct : B
Explanation: Calcium is the main element that gives strength and rigidity to bones and teeth. The human body needs more calcium than any other mineral, and at least 99% of it is found in bones and teeth.

3. Which is known as Master Gland ?

Correct : D
Explanation: The pituitary gland is known as the "master gland" because it controls the functions of many other endocrine glands. It's located at the base of the brain and is no larger than a pea.

4. Which fruit has its seed outside ?

Correct : D
Explanation: Strawberries are the only fruit that have their seeds on the outside. The average strawberry has about 200 seeds.

5. Washing of peeled vegetables removes which vitamin ?

Correct : C
Explanation: Washing peeled vegetables can remove vitamins B and C. Vitamins B and C are water-soluble, which means they can be leached into washing water. Vitamin C is also sensitive to air, heat, and water.

6. Rabies is a _____ disease.

Correct : A
Explanation: Rabies is a viral disease that affects the central nervous system of mammals. It is spread through the saliva of infected animals, most often through a bite.

7. Ice is packed into a sawdust becuase

Correct : B
Explanation: Sawdust and gunny bags are poor conductors of heat, so they prevent ice from melting quickly. The air trapped in the fine pores of the sawdust and gunny bag insulates the heat and prevents it from passing through to the ice.

8. When a stone is thrown in a calm water of a pond waves produced are

Correct : B
Explanation: When a stone is thrown into a pond, it produces transverse waves. This is caused by the ripple effect. The disturbance in the water moves outward as more pieces of water start to move up and down. The water in each place only moved up and down, but a wave moved outward from where the pebble entered the water.

9. Sun appears red in colour during sunrise and sunset due to

Correct : C
Explanation: The sun appears red during sunrise and sunset because red light scatters the least by air molecules.
Scattering of light is a phenomenon that occurs when light rays deviate from their original path after hitting an obstacle.

10. Which phenonmenon do bat or dolphins used to find prey, predators or obstacles ?

Correct : D
Explanation: Bats and dolphins use echolocation to find prey, predators, and obstacles. Echolocation is a physiological process that uses reflected sound waves to locate objects.

11. The swing of spinning cricket ball in air can be explained on the basis of

Correct : C
Explanation : Turbulence caused by wind can explain the swing of a spinning cricket ball. According to Bernoulli's principle, an increase in speed of a fluid results in a decrease in static pressure. This difference in pressure helps to keep the ball moving in the air. When the bowler applies spin to the ball, it causes one side to move faster through the air than the other. This creates a pressure difference that causes the ball to move in a curved path instead of a straight line.

12. A flying jet possesses

Correct : D
Explanation: A flying jet possesses both kinetic and potential energy. A jet possesses potential energy because it is displaced from the ground while in flight. It also possesses kinetic energy because it is in motion.

13. Tungsten is used for the manufacture of the filament of an electric bulb becuase

Correct : A
Explanation: Tungsten is used for the filament of an electric bulb because it has a high melting point, doesn't oxidize, and is highly flexible.

14. Vegetables are cooked in lesser time by adding a pinch of salt while cooking becuase

Correct : A
Explanation: Adding salt to boiling water can help food cook faster. This is because salt increases the boiling point of water, which means it will boil at a higher temperature.

15. Vineger is the common name of

Correct : C
Explanation: Vinegar is the common name for acetic acid. Acetic acid is also known as ethanoic acid. The chemical formula for acetic acid is CH3COOH.

16. Which is the purest commercial form of Iron ?

Correct :B
Explanation: Wrought iron is the purest form of commercial iron. It's a soft, ductile, and fibrous variety of iron that's made from a semi-fused mass of relatively pure iron globules.

17. Which gas is used as a fire extinguisher ?

Correct : B
Explanation: Carbon dioxide is non-flammable and incombustible, and it doesn't support combustion. It's stored in liquid form in extinguishers. When used, it displaces oxygen, which is required for combustion. Carbon dioxide is heavier than oxygen, so it forms a blanket around the burning substance and cuts off the oxygen supply. This effectively suffocates the fire and puts it out.

18. What is washing soda ?

Correct : A
Explanation: Washing soda is a chemical compound with the formula Na2CO3.10H2O, also known as sodium carbonate decahydrate. It's a whitish, odorless powder that's highly soluble in water and forms a strongly alkaline water solution.

19. Which gas is used to destroy the microbes ?

Correct : C
Explanation: Chlorine gas is used to kill germs and bacteria.

20. Night blindness results from the deficiency of :

Correct : B
Explanation: Night blindness is one of the first signs of vitamin A deficiency. Vitamin A is a fat-soluble vitamin and strong antioxidant that helps maintain good vision.
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