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Which of the following is used in a fire alarm? | UPPCS 2020 PYQ | UPPCS Manch

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2020
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2020ScienceGS Paper I

Which of the following is used in a fire alarm?

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2025Given below are two statements, one is labelled as Assertion (A) and the other as Reason (R). Assertion (A): Evaporation of sweat from human skin dissipates body heat. Reason (R): High humidity on a hot day increases discomfort. Select the correct answer from the code given below: Code:
2025Given below are two statements, one is labelled as Assertion (A) and the other as Reason (R).Assertion (A): Generally an alloy of lead and tin is used as a material of the fuse wire.Reason (R): Alloy of lead and tin has a higher melting point than copper and aluminium.Select the correct answer from the code given below:
2025Arrange the following electromagnetic radiations in decreasing order of their frequencies. 1. Gamma rays 2. Ultraviolet rays 3. Radio waves 4. X-rays Select the correct answer from the code given below :

2025Given below are two statements, one is labelled as Assertion (A) and the other as Reason (R). Assertion (A): Voices of men and women are different. Reason (R): Length and thickness of vocal cord is different in men and women. Select the correct answer from the code given below: Code:

2025Which of the following two are the major constituent of Bio-gas ? 1. Methane 2. Butane 3. Carbon dioxide 4. Carbon monoxide Select the correct answer from the code given below: Code:

2025With reference to Baking Soda', which of the following statements is/are correct? 1. It is Sodium hydrogen carbonate. 2. It is used in fire extinguishers. Select the correct answer from the code given below: Code: