1
NEET 2020 Phase 1
+4
-1
Two bodies of mass 4 kg and 6 kg are tied to the ends of a massless string. The string passes over a pulley which is frictionless (see figure). The acceleration of the system in terms of acceleration due to gravity (g) is :
A
g/2
B
g/5
C
g/10
D
g
2
NEET 2019
+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
C
10 $$\pi$$ rad/s
D
$$\sqrt {10}$$ rad/s
3
NEET 2019
+4
-1
A mass m is attached to a thin wire and whirled in a vertical circle. The wire is most likely to break when :
A
the wire is horizontal
B
inclined at an angle of 60o from vertical
C
the mass is at the lowest point
D
the mass is at the highest point
4
NEET 2018
+4
-1
Which one of the following statements is incorrect?
A
Rolling friction is smaller than sliding friction.
B
Limiting value of static friction is directly proportional to normal reaction.
C
Frictional force opposes the relative motion.
D
Coefficient of sliding friction has dimensions of length.
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