JEE
Prayas JEE (2026)
Physics
DPP: 4
Laws of Motion
Q1 Three blocks A, B and C of masses 4 kg, 2 kg A man of mass 90 kg is standing in an elevator
and 1 kg respectively, are in contact on a whose cable broke suddenly. If the elevator falls,
frictionless apparent weight of the man is:
surface, as shown. If a force of 14 N is applied on (A) 90 N
the 4 kg block, then the contact force between (B) 90 g N
A and B is: (C) 0 N
(D) Any negative value
Q4 Force of 3 N acts on a system of two blocks of
mass 2 kg and 1 kg as shown in figure. Contact
force between the block is:
(A) 6 N
(B) 8 N
(C) 18 N
(D) 2 N
Q2 Three blocks with masses m, 2 m and 3 m are
connected by strings, as shown in the figure. (A) 1 N
After an upward force F is applied on block m , (B) 2 N
the masses moves upward at constant speed v. (C) 3 N
What is the net force on the block of mass 2 m ? (D) 0
( g is the acceleration due to gravity)
Q5 Three blocks are connected as shown, on a
horizontal frictionless table and pulled to the
right with a force 60 N . If
m1 = 10 kg, m2 = 20 kg and m3 = 30 kg ,
the tension T2 is -
(A) 10 N
(B) 20 N
(C) 30 N
(A) (D) 60 N
6mg
(B) zero Q6 With what acceleration a should the box in the
(C) 2mg figure moving up so that the block of mass M
(D) 3mg exerts a force 7Mg/4 on the floor of the box?
Q3
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passing over a frictionless pulley. The tension in
the string is
(A) M +m
m
g
(A) g/4 (B) g/2 (B) M +m
M
g
(C) 3g/4 (D) 4g (C) M +m
Mm
g
(D) Mm
g
Q7 In the given arrangement, n number of M +m
equal masses are connected by strings of Q11 Three identical masses each of mass 4 kg are
negligible masses. The tension in the connected by massless inextensible strings. The
string connected to nth mass is string joining A and B passes over a massless
frictionless pulley as shown in figure. The tension
in the string connecting mass B and C is
(A) mMg
nm+M
(B) mMg
nmM
(C) mg
(D) mMg
nm−M
Q8 Three blocks of masses m1 , m2 and m3 are
connected by massless string as shown kept 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
(A) 40 N
(B) 20 N
(C) 26.67 N
(A) 20 N
(D) 13.33 N
(B) 40 N
(C) 10 N
Q12 For the system shown, string and pulley are
(D) 32 N
massless. The pulley is smooth. Acceleration of
the lighter block is: ( g is acceleration due to
Q9 Three blocks of masses 4 kg, 2 kg and 1 kg
gravity)
respectively are in contact on a frictionless table
as shown in the figure. If a force of 14 N is
applied on the 4 kg block, the contact force
between the 4 kg and the 2 kg block will be
(A) 2 N
(B) 6 N
(C) 8 N
(D) 14 N
(A) g
g
Q10 A block of mass M placed on a frictionless (B) 3
g
horizontal table is pulled by another block of (C) 9
mass m hanging vertically by a massless string (D) Zero
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Q13 In the figure shown, surface is frictionless. Forces which 4 kg mass starts moving up is [Take
are applied as shown in figure, then find tension g = 10 m/s
2
]
T2 .
(A) 250
3
N
(B) 190
3
N
(C) 90 N
(D) 50 N
(A) 1 m/s
2
(B) 2 m/s
2
Q14 In the given figure a boy of mass 40 kg is just
(C) 5 m/s
2
pulling a mass of 5 kg at an angle of 30∘ with
(D) 4 m/s
2
the horizontal. While the boy is standing on a
weighing machine, what would be its reading?
(A) 37.5 kg
(B) 40 kg
(C) 42.5 kg
(D) 38.5 kg
Q15 A block of mass M is pulled by a force F
making angle θ with horizontal on a smooth
horizontal surface as shown. If a is the
acceleration of block on the surface, then contact
force between the block and the surface is
(A) M g + M a cos θ
(B) M g − M a cos θ
(C) M g + M a tan θ
(D) M g − M a tan θ
Q16 In the system shown, pulley is massless and
string is light and inextensible. Acceleration with
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Answer Key
Q1 (A) Q9 (B)
Q2 (B) Q10 (D)
Q3 (C) Q11 (C)
Q4 (A) Q12 (B)
Q5 (C) Q13 (A)
Q6 (C) Q14 (A)
Q7 (A) Q15 (D)
Q8 (D) Q16 (C)
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