If a potato is placed on a pure paper plate which is white and unprinted and put in a microwave oven, the potato heats up but the paper plate does not. This is because:
Prelims
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Science and Technology › Chemistry
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Science and Technology › Chemistry
Which one of the following is used as an explosive ?
Options
Answer
(D)
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Science and Technology › Chemistry
Which one of the following is also called Stranger Gas?
Options
Answer
(C)
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Science and Technology › Chemistry
What are rubies and sapphires chemically known as?
Options
Answer
(B)
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Science and Technology › Chemistry
What is the pH level of blood of a normal person?
Options
Answer
(C)
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Science and Technology › Defence
Science and Technology › Defence
Which of the following statements with regard to drone swarms is/are correct?
1. They use Terahertz band of frequency to communicate with the command centre.
2. Individual drones in the swarm can communicate with other drones in the swarm.
3. GPS Spoofing is a commonly used technique to counter drone swarm attack.Options
Answer
(b) 2 and 3 only
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Science and Technology › Defence
Which of the following statements with regard to stealth technology is/are correct?
1. Stealth objects have a very small radar cross-section and are coated with Radar Absorbing Material.
2. Stealth objects can be detected using specific frequencies.
3. Stealth objects are coated with metamaterials to increase the scattering of electromagnetic radiation.Options
Answer
(c) 1 and 2 only