Physics - Section 1 | Multiple Questions and Answers

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Physics - Section 1 Multiple Questions and Answers.

71.	Natural radioactivity was discovered by

	A.	Marie Curie
	B.	Ernest Rutherford
	C.	Henri Becquere
	D.	Enrico Fermi

72.	Planets are

	A.	luminous heavenly bodies revolving around a star
	B.	non-luminous heavenly bodies
	C.	luminous heavenly bodies that twinkle
	D.	luminous heavenly bodies that do not twinkle

73.	Mica is used in electrical appliances such as electric iron because mica is

	A.	a good conductor of heat but a bad conductor of electricity
	B.	a bad conductor of heat but a good conductor of electricity
	C.	a good conductor of heat as well as electricity
	D.	a bad conductor of heat as well as electricity

74.	It is easier to roll a barrel full of coal tar than to pull it because

	A.	the full weight of the barrel comes into play when it is pulled
	B.	the rolling friction is much less than the sliding friction
	C.	more surface area of the barrel is in contact with the road when it is pulled
	D.	coal tar is a liquid and it flows in the barrel when it is rolled

75.	Minimum number of unequal vectors which can give zero resultant are

	A.	two
	B.	three
	C.	four
	D.	more than four

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