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Prelims -General Science

Question:The roaring of the thunder is due to 1. Multiple reflections of sound 2. Refraction of Sound -View

(a) Only 1

(b) Only 2

(c) Both 1 and 2

(d) Neither 1 Nor 2

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Answer:
Explanation

Echoes can be heard more than once due to successive or multiple reflections from different reflecting surfaces .For eg , roaring of thunder is due to successive reflection of sound from reflecting surfaces like the clouds and the land.

Question:Green fluorescent protein is found in -View

(a) Jelly fish

(b) Shark fish

(c) star fish

(d) Octopus

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Answer:
Explanation

• Bioluminescence and fluorescence from proteins such as Green Fluorescent Protein (GFP) has likely existed in creatures such as jellyfish for millions of years. • GFP is a ~27 kDa protein consisting of 238 amino acids derived from the crystal jellyfish Aequorea victoria. • The 2008 Nobel Prize in Chemistry has been awarded jointly to Japanese scientist Osamu Shimomura and US researchers Martin Chalfie and Roger Tsien, for the discovery and development of the green fluorescent protein (GFP).

Question:Identify the correct statement (s) -View

(a) A human brain makes up about 1.9% of total body weight.

(b) A human brain requires 20% of the total blood supply.

(c) Both (a) & (b) are correct.

(d) Neither (a) nor (b) is correct

Check Answer:

Answer:
Explanation

Question:The type of respiration in Earthworm is known as -View

(a) Seatal Respiration

(b) Tubular Respiration

(c) Tracheal Respiration

(d) Cutaneous Respiration

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Answer:
Explanation

Earthworms breathe through their skins. The skin of an earthworm feels moist and slimy on touching. Gases can easily pass through them. Though frogs have pair of lungs like human beings, they can also breathe through their skin, which is moist and slippery.

Question:Diodes are used to 1. turn AC into DC. 2. protect circuits by limiting the voltage. 3. detect Ionizing radiation. -View

(a) Only 3

(b) 1, 2 and 3

(c) Only 1 and 2

(d) None of these

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Answer:
Explanation

 A diode is a device which has two active electrodes and two terminals and allows the current to pass only in single direction. These devices are used to protect circuits by limiting the voltage and also turn AC into DC (Rectification). Semiconductors like silicon and germanium are used to make most of the diodes.

Question:Consider the following statements. 1. A man can see his full image in a plane mirror whose height is half of his height. 2. Concave mirror is used as shaving mirror. Which of the above statements is/are true? -View

(a) Only 1

(b) Only 2

(c) Both 1 and 2

(d) Neither 1 Nor 2

Check Answer:

Answer:
Explanation

Question:Consider the following statements. 1. From violet to red wavelength of light increases. 2. Convex mirror is used as safety viewers on upper deck buses. Which of the above statements is/are FALSE? -View

(a) Only 1

(b) Only 2

(c) Both 1 and 2

(d) Neither 1 Nor 2

Check Answer:

Answer:
Explanation

Question:Identify the correct statement(s). -View

(a) The velocity of sound in hydrogen is greater than that in oxygen because hydrogen is a lighter gas.

(b) Sound waves of different frequencies travel with different speed in air.

(c) Both (a) & (b)

(d) Neither (a) nor (b)

Check Answer:

Answer:
Explanation

The velocity of sound in hydrogen is greater than that in oxygen because hydrogen is a lighter gas. Sound waves of different frequencies travel with same speed in air.

Question:A wide variety of pests, including moths, beetles, cockroaches, ants, ticks, and mosquitoes survived Bhopal gas tragedy. This is because of -View

(a) Uneven Diffusion

(b) External wax like secretions

(c) Methyl Iso Cyanate was converted into a non poisonous substance due to metabolism in these animals.

(d) Exoskeleton

Check Answer:

Answer:
Explanation

• Methyl Iso Cyanate is denser than air.

Question:Consider the following statements. 1. Boiling point of liquids increase with increase in pressure. 2. Mercury has uniform coefficient of thermal expansion over a wide range of temperature. Which of the above statements is/are FALSE?. -View

(a) Only 1

(b) Only 2

(c) Both 1 and 2

(d) Neither 1 Nor 2

Check Answer:

Answer:
Explanation

• Melting point of a substance decreases while its boiling point increases with mixing of impurities.