The Van Vihar National Park is located in which state?
Answer: B
Van Vihar National Park is in Madhya Pradesh, on the shore of the Upper Lake in Bhopal.
It is unusual in being both a national park and a zoological park: the animals live in near-natural enclosures, and most were rescued or born in captivity.
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The animal which uses sound as its ‘eyes’ is
Answer: A
The bat uses sound as its eyes. It emits ultrasonic pulses and builds a picture of its surroundings from the returning echoes - a process called echolocation.
The technique is precise enough to catch a flying insect in total darkness. Dolphins and some whales use it in water; owls hunt by acute hearing but do not emit sound of their own.
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'No two electrons in an atom can have the same set of four quantum numbers' is
Answer: D
The rule that no two electrons in an atom may share all four quantum numbers is Pauli's exclusion principle.
It is why each orbital holds at most two electrons, of opposite spin, and it is what gives the periodic table its structure. The Aufbau principle is different: it says orbitals fill in order of increasing energy.
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Which of the following is generally true about the stratosphere?
Answer: A
The stratosphere is very dry. Almost no water vapour reaches it, because air rising through the tropopause is chilled to about −60°C and its moisture freezes out first.
The layer is also very stable, with temperature rising with height, so there is little vertical mixing to carry moisture up. This is why jet aircraft cruise there in cloudless air.
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PVC is obtained by the polymerisation of?
Answer: A
PVC is made by polymerising vinyl chloride, CH2=CHCl.
The molecules add end to end into long chains. PVC is rigid on its own and is used for pipes and window frames; adding a plasticiser makes it flexible for cable insulation and sheeting.
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Which thermometer is used to indicate the lowest temperature ?
Answer: D
The alcohol thermometer reads the lowest temperatures. Alcohol freezes at about −115°C, so it stays liquid far below mercury, which freezes at −39°C.
This is why alcohol thermometers are used in polar and high-altitude conditions, usually with the alcohol dyed red to make it visible.
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Nuclear fission is caused by the impact of
Answer: A
Nuclear fission is triggered by the impact of a neutron.
Being uncharged, a neutron is not repelled by the nucleus and can reach it at low energy. Each fission releases two or three more neutrons, which is what makes a chain reaction possible.
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Branch of science which deals with the study of skin of man-
Answer: D
Dermatology is the branch of medicine dealing with the skin, from the Greek derma.
It also covers hair and nails. The skin is the body's largest organ, about 1.7 square metres and a sixth of body weight in an adult.
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Eugenics is the study of
Answer: A
Eugenics is the study of ways to improve or impair the inherited qualities of future generations, physically or mentally, by controlling who reproduces.
Galton coined the term in 1883. In the twentieth century it was used to justify forced sterilisation and worse, and it is now wholly discredited as a programme.
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Urea is removed from the blood by:
Answer: C
Urea is removed from the blood by the kidneys.
It is made in the liver from the ammonia produced by breaking down surplus amino acids, carried in the blood to the kidneys, filtered out at the glomerulus and excreted in urine. A healthy adult passes about 25 to 30 g of it a day.
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