Video Mock Test series (Full Test -1)
PHYSICS A lift starts going up from rest. It’s acceleration is shown in fig., plotted against time. Time when lift comes to instantaneous rest is ...........
1.
a (m/s2)
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IA
1 t
t(sec)
4
(A) 4 sec
(B) 8 sec
D
-2
(C) 10 sec
(D) 12 sec
A person throws vertically up n bolls per second with the same velocity. He throws a ball whenever the previous one is at its highest point. The height to which the balls rise is : (A) g/n2 (B) 2gn (C) g/2n2 (D) 2gn2
3.
Raindrops are falling vertically with a velocity of 10 m/s. To a cyclist moving on a straight road the raindrops appear to be coming with a velocity of 20 m/s. The velocity of cyclist is (B) 10 3 m/s
(C) 20 m/s
(D) 20 3 m/s
O
(A) 10 m/s
SI
N
2.
A 50 kg person stand on a 25 kg platform. He pulls on the rope which is attached to the platform via the frictionless pulleys as shown in the figure. The platform moves upwards at a steady rate if the force with which the person pulls the rope is
ET O
4.
(A) 500 N
(B) 250 N
(C) 25 N
(D) None
A point mass moves along a circle of radius R with a constant angular acceleration . How much time is needed after motion begins for the radial acceleration of the point mass to be equal to its tangential acceleration ?
5.
(A)
1
(B)
R
(C)
2
(D)
1 2
The system shown is just on the verge of slipping. The co-efficient of static friction between the block and the table top is : W = 40N 30°
6.
W = 8N (A) 0.5
1
(B) 0.95
(C) 0.15
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(D) 0.35
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