91 Q) "Consider the following statements
I.Atom bomb is an example nuclear fission,
II.Hydrogen bomb is an example of nuclear fusion.
Which of the statements given above is/are correct?."
(a) Only I
(b) Only II
(c)Both I and II
(d) Neither I nor II
92 Q) The most familiar form of radiant energy in sunlight that cause tanning and has the potential for causing melanoma in humans is called
(a) infra-red radiation
(b) visible radiation
(c) ultra-violet radiation
(d) microwave radiation
93 Q) Which one of the following planets is said to be "twin sister" of the Earth?.
(a) Mercury
(b) Venus
(c) Mars
(d) Jupiter
94 Q) "The time period of a simple pendulum having a spherical wooden bob is 2 s. If the bob is replaced by a metallic one twice as heavy, the time period will be
"
(aj more than 2 s
(b) 2 s
(c) 1 s
(d) less than 1 s
95 Q) "Ball bearings are used in bicycles, cars, etc., because?.
"
(a)The actual area of contact between the wheel and axle is increased
(b)The effective area of contact between the wheel and axle increased
(c)The effective area of contact between the wheel and axle is reduced
(d)None of the above statements is correct
96 Q) "Which one among the following satellites is used to reflect the radio-signals back to the Earth?
"
(a) Natural satellite
(b) Active satellite
(c) Passive satellite
(d) None of these
97 Q) "Consider the following statements.
I. Atom bomb is based upon the principle of uncontrolled nuclear fusion.
II. Hydrogen bomb is based upon the principle of uncontrolled nuclear fusion.
III. Nuclear reactor is based upon the principle of uncontrolled nuclear fusion.
Which of the statements given above is/are correct?."
(a)I, II and III
(b) I and III
(c) II and III
(d) Only II
98 Q) "A coin immersed in water pond appears to be raised when view from the top. What is this due to?
"
(a)Total internal reflection of light
(b)Refraction of light
(c)Scattering of light
(d)Reflection of light
99 Q) "Assertion (A) It is difficult to move a cycle along the road with its breaks on.
Reason (R) Sliding friction is greater than rolling friction."
(a)Both A and R are true and R is the correct explanation of A
(b)Both A and R are true but R is not the correct explanation of A
(c)A is true but R is false
(d)A is false but R is true
100 Q) "A body lying at rest suddenly breaks into two parts of equal masses which starts moving. The parts will move in
"
(a)opposite direction with equal speed
(b)opposite direction with unequal speed
(c)any direction with equal speed
(d)same direction with equal speed
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