A block is kept on a frictionless inclined surface with an angle of inclination 'α'. The incline is given an acceleration 'a' to keep the block stationary. Then a is equal to 

(1) g

(2) gtanα

(3) g/tanα

(4) gcosecα

Subtopic:  Pseudo Force |
 84%
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A block of mass M is pulled along a horizontal frictionless surface by a rope of mass m. If a force P is applied at the free end of the rope, the force exerted by the rope on the block will be: 

(1) P

(2) PmM+m

(3) PMM+m

(4) PmMm

Subtopic:  Application of Laws |
 64%
From NCERT
PMT - 1993
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Three equal weights A, B and C of mass 2 kg each are hanging on a string passing over a fixed frictionless pulley as shown in the figure The tension in the string connecting weights B and C is 

(1) Zero

(2) 13 N

(3) 3.3 N

(4) 19.6 N

Subtopic:  Application of Laws |
 61%
From NCERT
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Two masses of 4 kg and 5 kg are connected by a string passing through a frictionless pulley and are kept on a frictionless table as shown in the figure. The acceleration of 5 kg mass is

(1) 49 m/s2

(2) 5.44 m/s2

(3) 19.5 m/s2

(4) 2.72 m/s2

Subtopic:  Application of Laws |
 81%
From NCERT
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Two masses 2 kg and 3 kg are attached to the end of the string passed over a pulley fixed at the top. The tension and acceleration are

(1) 7g8;g8

(2) 21g8;g8

(3) 21g8;g5

(4) 12g5;g5

Subtopic:  Application of Laws |
 86%
From NCERT
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Three blocks A, B and C weighing 1, 8 and 27 kg respectively are connected as shown in the figure with an inextensible string and are moving on a smooth surface. T3 is equal to 36 N. Then T2 is 

(1) 18 N

(2) 9 N

(3) 3.375 N

(4) 1.25 N

Subtopic:  Newton's Laws |
 86%
From NCERT
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Two bodies of mass 3 kg and 4 kg are suspended at the ends of massless string passing over a frictionless pulley. The acceleration of the system is (g = 9.8 m/s2

(1) 4.9 m/s2

(2) 2.45 m/s2

(3) 1.4 m/s2

(4) 9.5 m/s2

Subtopic:  Application of Laws |
 88%
From NCERT
PMT - 2001
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Three solids of masses m1, m2 and m3 are connected with weightless string in succession and are placed on a frictionless table. If the mass m3 is dragged with a force T, the tension in the string between m2 and m3 is 

(1) m2m1+m2+m3T

(2) m3m1+m2+m3T

(3) m1+m2m1+m2+m3T

(4) m2+m3m1+m2+m3T

Subtopic:  Application of Laws |
 69%
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Three blocks of masses m1, m2 and m3 are connected by massless strings as shown on a frictionless table. They are pulled with a force T3 = 40 N. If m1 = 10 kg, m2 = 6 kg and m3 4 kg, the tension T2 will be 

(1) 20 N

(2) 40 N

(3) 10 N

(4) 32 N

Subtopic:  Application of Laws |
 80%
From NCERT
PMT - 1998
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A light string passes over a frictionless pulley. To one of its ends a mass of 6 kg is attached. To its other end a mass of 10 kg is attached. The tension in the thread will be 

(1) 24.5 N

(2) 2.45 N

(3) 79 N

(4) 73.5 N

Subtopic:  Application of Laws |
 78%
From NCERT
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