1
NEET 2019
MCQ (Single Correct Answer)
+4
-1
A solid cylinder of mass 2 kg and radius 4 cm is rotating about its axis at the rate of 3 rpm. The torque required to stop after 2$$\pi $$ revolutions is :
A
2 × 10–3 N m
B
2 × 10–6 N m
C
2 × 106 N m
D
12 × 10–4 N m
2
NEET 2019
MCQ (Single Correct Answer)
+4
-1
A 800 turn coil of effective area 0.05 m2 is kept. perpendicular to a magnetic filed 5 × 10–5 T. When the plane of the coil is rotated by 90o around any of its coplanar axis in 0.1 s, the emf induced in the coil will be :
A
0.2 V
B
0.02 V
C
2 V
D
2 $$ \times $$ 10-3 V
3
NEET 2019
MCQ (Single Correct Answer)
+4
-1
A block of mass 10 kg is in contact against the inner wall of a hollow cylindrical drum of radius 1 m. The coefficient of friction between the block and the inner wall of the cylinder is 0.1. The minimum angular velocity needed for the cylinder to keep the block stationary when the cylinder is vertical and rotating about its axis, will be : (g = 10 m/s2)
A
$${{10} \over {2\pi }}$$ rad/s
B
10 rad/s
C
10 $$\pi $$ rad/s
D
$$\sqrt {10} $$ rad/s
4
NEET 2019
MCQ (Single Correct Answer)
+4
-1
The speed of a swimmer in still water is 20 m/s. The speed of river water is 10 m/s and is flowing due east. If he is standing on the south bank and wishes to cross the river along the shortest path, the angle at which he should make his strokes w.r.t. north is given by :
A
0o
B
60
C
45o west
D
30o west
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