21. Which of the following planet has the fastest period of revolution?
(A) Earth
(B) Mars
(C) Mercury
(D) Pluto
Answer:
(C) Mercury
Explanation:
Mercury is the closest planet to the Sun and has the shortest orbital period (revolution) in the Solar System (88 days).
22. Which of the following is used in pencils?
(A) Graphite
(B) Silicon
(C) Charcoal
(D) Phosphorous
Answer:
(A) Graphite
Explanation:
The “lead” inside pencils is actually a mixture of graphite and clay.
23. Electric bulb filament is made of
(A) Copper
(B) Aluminum
(C) Lead
(D) Tungsten
Answer:
(D) Tungsten
Explanation:
Tungsten is used for incandescent bulb filaments because of its extremely high melting point.
24. Which is the following Indian Peninsular River known as ‘Dakshin Ganga’?
(A) Brahmani
(B) Cauvery
(C) Godavari
(D) Krishna
Answer:
(C) Godavari
Explanation:
The Godavari is the largest river in peninsular India and is colloquially known as the Dakshin Ganga (Ganges of the South).
25. Which of the following country has a border with India to the north west?
(A) Afghanistan
(B) Myanmar
(C) Sri Lanka
(D) Bhutan
Answer:
(A) Afghanistan
Explanation:
India shares its North-West borders with Pakistan and a small portion with Afghanistan (in the PoK region).
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