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NSEP 11th 2025
DPP-01
NLM and Friction
1.
Three blocks are connected as shown in fig., on a
horizontal frictionless table and pulled to the right
with a force T3 = 60N. If m1 = 10 kg,
m2 = 20 kg, m3 = 30 kg. the tension T2 isT1
m1
m
(A) same
(C) 2 : 1
2m
m
F
m1
m2
37°
37°
5.
Ratio of masses of smaller and larger block is
4
3
(A)
(B)
5
5
2
8
(C)
(D)
5
5
6.
The minimum possible value of acceleration is
(A) 1 m/s2
(B) 6 m/s2
2
(C) 8 m/s
(D) 1.5 m/s2
7.
In the situation shown in the figure, block A is stopped
for a moment, after 3 sec system is set into motion.
Find the time elapsed before the string is tight again.
B
(B) 1 : 2
(D) 1 : 3
1 kg
Two forces of 6N and 3N are acting on the two
blocks of 2kg and 1kg kept on frictionless floor.
What is the force exerted on 2kg block by 1kg
block?
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(B) 2N
(D) 5N
The sum of masses is 8 kg. The maximum tension in
the string is 22.5 N. The blocks are released from rest.
(B) 2 N
(D) zero
Two blocks are in contact on a frictionless table.
One has mass m and the other 2m. A force F is
applied on 2m as shown in the figure. Now the same
force F is applied from the right on m. In the two
cases respectively, the ratio of force of contact
between the two block will be:
2m
3N
1kg
Passage: (Question no. 5-6)
A light string passing over a fixed smooth pulley
carries two varying variable unequal masses placed
on smooth inclined planes as shown in the figure
In the following figure, two blocks on m1 = 2kg and
m2 = 1 kg are in contact with a frictionless table. A
horizontal force F = 3N is applied to mass m1, the
contact force between m1 and m2 will be:
m1 = 2kg
m2 = 1kg
F
F'
F'
F
4.
m3
(B) 20 N
(D) 60 N
(A) 1 N
(C) 3 N
3.
(A) 1N
(C) 4N
2kg
T3
m2
(A) 10 N
(C) 30 N
2.
T2
6N
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1 kg A
(A) 1 s
(C) 3 s
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(B) 2 s
(D) 4 s
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8.
A painter of mass 100 kg is raising himself and the
crate (such an arrangement is called Bosun’s chair) on
which he stands as shown. When he pulls the rope the
force exerted by him on the crate’s floor is 450 N. If
the crate weighs 25 kg then, find the acceleration of
the system and the tension in the rope.
(A) 107 N
(C) 207 N
11.
(A) a = 3 ms−2, T = 600 N
(B) a = 4 ms−2, T = 600 N
(C) a = 2 ms−2, T = 750 N
(D) a = 1 ms−2, T = 750 N
9.
Two monkeys of masses 10 kg and 8 kg are moving
along a vertical light rope, the former climbing up
with an acceleration of 2 m/s2, while the latter
coming down with a uniform velocity of 2 m/s.
Find tension in the rope at the fixed support.
(A) 180 N
(C) 80 N
(B) 200 N
(D) 216 N
Reading of spring balance is (g = 10 m/s2):
12.
(A) 1 kg wt
(C) 3 kg wt
10.
(B) 113 N
(D) 13 N
A string of negligible mass going over a clamped
pulley of mass m supports a block of mass M as
shown in the figure. The force on the pulley by the
clamp is given :
(B) 2 kg wt
(D) 4 kg wt
Three monkeys A, B and C of masses 5 kg, 3 kg
and 2 kg, respectively are moving along a vertical
rope of mass 10 kg as shown in the figure. The
monkey A is moving upward with an acceleration
of 2 m/s2, the monkey B is moving downward with
an acceleration of 1 m/s2 while the monkey C is
moving downward with constant velocity of 4 m/s.
The force exerted by the rope on the ceiling is
13.
(A)
2Mg
(C)
(M + m)2 + m2 g (D)
(B)
2mg
(M + m)2 + M2 g
In the arrangement shown, the 2 kg block is held to
keep the system at rest. The string and pulley are
ideal. When the 2 kg block is set free, by what
amount the tension in the string changes?
[g = 10 m/s2]
A
B
C
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(A) Increase of 12 N
(C) Increase of 18 N
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(B) Decrease of 12 N
(D) Decrease of 18 N
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Answer Key
1.
(C)
8.
(C)
2.
(A)
9.
(D)
3.
(B)
10.
(C)
4.
(C)
11.
(B)
5.
(B)
12.
(D)
6.
(D)
13.
(B)
7.
(C)
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Library
Telegram
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