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Prelims -General Science

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

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Answer:
Explaination

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:
Explaination

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:
Explaination

 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

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Answer:
Explaination

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

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Answer:
Explaination

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)

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Answer:
Explaination

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

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Answer:
Explaination

• 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

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Answer:
Explaination

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

Question:It is known as "Sprout Leaf Plant" -View

(a) Cactus

(b) Venus Trap

(c) Bryophyllum

(d) None of these

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Answer:
Explaination

Some plants like Bryophyllum (sprout leaf plant), Begonia can be propagated by leaves.

Question:Nobel Metal(s) is/are 1. Gold 2. Mercury 3. Platinum -View

(a) Only 2 & 3

(b) Only 2

(c) Both 1 and 2

(d) 1, 2 and 3

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Answer:
Explaination

• The noble metals are a group of metals that resist oxidation and corrosion in moist air. The noble metals are not easily attacked by acids. They are the opposite of the base metals, which more readily oxidize and corrode. • There is more than one list of noble metals. The following metals are considered noble metals (listed in order of increasing atomic number):  ruthenium  rhodium  palladium  silver  osmium  iridium  platinum  gold Sometimes mercury is listed as a noble metal. Other lists include rhenium as a noble metal. Strangely, not all corrosion-resistant metals are considered to be noble metals. For example, although titanium, niobium and tantalum are extremely corrosion-resistant, they are not noble metals.