Motion of Connected Bodies MCQ
1. Three weights A, B and C of mass 2 kg each are hanging on string passing through a frictionless pulley. What is the tension in the string connecting weights B and C?
a) 13 N
b) 19.6 N
c) 3.3 N
d) 0
Answer: (a) 13 N
2. A frictionless pulley kept on a horizontal table connects two blocks of masses 4 kg and 5 kg. What is the acceleration of 5 kg mass?
a) 5.44 m/s2
b) 2.72 m/s2
c) 19.5 m/s2
d) 49 m/s2
Answer: (a) 5.44 m/s2
3. Three blocks A, B and C each weighing 1, 8, and 27 kg respectively are connected to each other by an inextensible string and are moving on a smooth surface. If T3 is equal to 36 N, then what will T2 be equal to?
a) 9 N
b) 18 N
c) 3.375 N
d) 1.25 N
Answer: (a) 9 N
4. A string passing over a frictionless pulley has a mass of 6 kg attached to one of its ends. To the other end a mass of 10 kg is attached. What is the tension in the thread?
a) 2.45 N
b) 24.5 N
c) 73.5 N
d) 79 N
Answer: (c) 73.5 N
5. What will the acceleration of the system of two masses connected to a pulley be if the masses weigh 5 kg and 10 kg?
a) g
b) g/2
c) g/3
d) g/4
Answer: (c) g/3
6. A block of mass which weighs 4 kg is suspended through spring balances A and B. Then A and B will read respectively
a) 0 kg and 4 kg
b) 4 kg and 0 kg
c) 4 kg and 4 kg
d) 2 kg and 2 kg
Answer: (c) 4 kg
