1

IIT-JEE 1986

MCQ (More than One Correct Answer)
A reference frame attached to the earth
A
is an inertial frame by definition
B
cannot be an inertial frame because the earth is revolving around the sun
C
is an inertial frame because Newton's laws are applicable in this frame
D
cannot be an inertial frame because the earth rotating about its own axis
2

IIT-JEE 1982

MCQ (More than One Correct Answer)
In the arrangement shown in Fig. the ends P and Q of an unstretchable string move downwards with uniform speed U. Pulleys A and B are fixed.
Mass M moves upwards with a speed
A
$$2U\cos \theta $$
B
$${U \over {\cos \theta }}$$
C
$${{2U} \over {\cos \theta }}$$
D
$$U\cos \theta $$

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