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Q. Name the greenhouse gas discharged from a refrigerator.

A. CFC / HFC

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Q. Which layer of atmosphere is susceptible to storm and rain?

A. Troposphere Explanation: Troposphere is the lowest layer nearest to Earth's surface, where...

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Q. Identify the greenhouse gas: (a) Oxygen (b) Hydrogen (c) Water vapour (d) Nitrogen

A. (c) Water vapour Explanation: Greenhouse gases are gases that trap heat in...

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Q. What is now used in electrical circuits instead of fuse wire?

A. MCB / Miniature circuit breaker

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Q. What type of lens is used as a magnifying glass?

A. Convex lens Explanation: Convex lens forms virtual, erect, magnified image for objects...

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Q. Which metal is used as catalyst in Haber’s process for preparation of ammonia?

A. The metal used as a catalyst in the Haber’s process for the...

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Q. Which gas is produced at the cathode during electrolysis of acidified water?

A. Hydrogen. Explanation: In electrolysis of acidified water with Pt electrodes, H⁺ ions...

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Q. State True or False: Electrolysis always involves the process of oxidation-reduction.

A. True. Explanation: Electrolysis drives chemical reactions using electrical energy, involving oxidation at...

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Q. Which one of the following is the unit of electrical energy? (a) Watt (b) Ohm...

A. (c) Kilowatt-hour Explanation: Electrical power is defined as work done per unit...

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Q. Which type of mirror produces virtual, diminished and erect image?

A. (c) Convex mirror Explanation: A convex mirror always forms an image which...

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Q. Which parameter remains unaltered during refraction of light?

A. (c) Frequency Explanation: During refraction, a light ray bends because its speed...

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Q. The coefficient of thermal conduction depends on

A. (b) property of the material of the conductor

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