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Quiz 48
Mdcat-past-papers Quiz
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941. A boy throws a ball vertically upward. At highest point it has:
Kinetic energy
Both energies
Potential energy
Lacks both
942. 4 bricks, 6cm thick, mass 2Kg lie flat. Work to stack them one over other?
10J
15J
20J
11.7J
943. Food we eat in 1 day ≈ energy of:
0.33 litre petrol
1 litre petrol
0.5 litre petrol
2 litre petrol
944. If speed of car is halved, kinetic energy becomes:
½
¼
⅛
1⁄16
945. 1hp is equal to:
476 watts
647 watts
746 watts
467 watts
946. 1KWb =
0.36 × 10⁶ J
36 × 10⁵ J
3.6 × 10⁶ J
0.036 × 10⁶ J
947. An object has 1J of P.E. What is work done in terms of height?
1J
0J
10J
0.1J
948. Relation between K.E and momentum P:
K.E = ½ P/M
K.E = ½ P²/M
K.E = ½ P²/M²
K.E = ½ P²
949. Dolphin leaves water with kinetic energy. At top it has:
Kinetic energy
Potential energy
Elastic potential energy
Neither
950. A ball with momentum 8Kg•m/s rebounds straight back without K.E loss. Change in momentum:
4Ns
-16Ns
16Ns
8Ns
951. If mass 'm' dropped from height 'h', force of friction 'f', velocity at bottom 'v', relation is:
½mv² = mgh + fh
mgh = ½mv² - fh
fh - mgh + ½ mv²
mgh = ½ mv² + fh
952. In energy inter-conversion, work done against friction is:
Ef
fh
mgh
f/h
953. A boy raises 10Kg object to height 5m. Stored potential energy:
491J
981J
490J
980J
954. Work done by gravity pulling 10N stone from 250m cliff to ground:
250J
25J
2500J
25000J
955. Ball of mass 'm' dropped from height 'h' penetrates 'd' in sand. Average resistive force is:
mg(d/h)
mg(h/d)
mg(1 + h/d)
mg(1 - h/d)
956. If body mass 'm' and velocity 'v', then velocity becomes double. K.E becomes:
2 times increased
2 times decreased
4 times increased
4 times decreased
957. Angular displacement of a point moving in a circle 10 cm when displacement of projection of this point along vertical diameter of circle is 8.66 cm will be:
30°
45°
60°
75°
958. A body is moving in a circle with increasing angular velocity. At time t = 6 s the angular velocity is 27 rad/s. What is the radius of circle where linear velocity is 81 cm/s:
6 cm
9 cm
7 cm
3 cm
959. A wheel starts rotating from rest with an angular acceleration of 2 rad/s² till its angular speed becomes 6 rad/s. The angular displacement will equal to:
4 rad
9 rad
7 rad
12 rad
960. The number of revolutions in 3π radians is:
Jan-60
2-Mar
2
6
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