Laws of Motion & Friction · JEE Main previous year questions

204 questions asked across 19 exam years, newest first

Year-wise papers Topic-wise questions

Practise this topic

2022 32 questions

Q342022 · 29 Jul 2022 · Shift 1
1. A.
2. B.
3. C.
4. D.
Show answer
Answer: A
Q362022 · 29 Jul 2022 · Shift 2
1. A. $1.2 \times 1 0^{- 5} N$ directed towards wire X.
2. B. $1.2 \times 1 0^{- 4} N$ directed away from wire X.
3. C. $1.2 \times 1 0^{- 4} N$ directed towards wire X.
4. D. $2.4 \times 1 0^{- 5} N$ directed towards wire X.
Show answer
Answer: A
Q432022 · 29 Jul 2022 · Shift 2
1. A. $30 N$
2. B. $40 N$
3. C. $50 N$
4. D. $60 N$
Show answer
Answer: B
Q442022 · 29 Jul 2022 · Shift 2
If momentum of a body is increased by 20%, then its kinetic energy increases by
1. A.36%
2. B.40%
3. C.44%
4. D.48%
Show answer
Answer: C
Q542022 · 29 Jul 2022 · Shift 2· Numerical answer
The velocity of a small ball of mass $0.3 g$ and density $8 g/cc$ when dropped in a container filled with glycerine becomes constant after some time. If the density of glycerine is $1.3 g/cc$ , then the value of viscous force acting on the ball will be $x \times 1 0^{- 4} N$ . The value of $x$ is ____. [use $g = 10 m/ s^{2}$ ]
Show answer
Answer: 25
Q552022 · 29 Jul 2022 · Shift 2· Numerical answer
The speed of a transverse wave passing through a string of length $50 cm$ and mass $10 g$ is $60 m s^{- 1}$ . The area of cross-section of the wire is $2.0 m m^{2}$ and its Young's modulus is $1.2 \times 1 0^{11} N m^{- 2}$ . The extension of the wire over its natural length due to its tension will be $x \times 1 0^{- 5} m$ . The value of $x$ is ____.
Show answer
Answer: 15
Q462022 · 28 Jul 2022 · Shift 1
The equation $λ = \frac{1.227}{x} nm$ can be used to find the de-Brogli wavelength of an electron. In this equation $x$ stands for : Where $m = mass of electron$ $P = momentum of electron$ $K = Kinetic energy of electron$ $V = Accelerating potential in volts for electron$
1. A. $mK$
2. B. $P$
3. C. $K$
4. D. $V$
Show answer
Answer: D
Q342022 · 28 Jul 2022 · Shift 2
1. A.6
2. B.2
3. C.1.5
4. D.4
Show answer
Answer: D
Q342022 · 27 Jul 2022 · Shift 1
A bag is gently dropped on a conveyor belt moving at a speed of $2 m/s$ . The coefficient of friction between the conveyor belt and bag is $0.4$ . Initially, the bag slips on the belt before it stops due to friction. The distance travelled by the bag on the belt during slipping motion, is : [Take $g = 10 m/s^{2}$ ]
1. A. $2 m$
2. B. $0.5 m$
3. C. $3.2 m$
4. D. $0.8 m$
Show answer
Answer: B
Q332022 · 27 Jul 2022 · Shift 2
A block of mass $M$ slides down on a rough inclined plane with constant velocity. The angle made by the incline plane with horizontal is $θ$ . The magnitude of the contact force will be :
1. A. $Mg$
2. B. $Mg cos θ$
3. C. $Mg sin θ + Mg cos θ$
4. D. $Mg sin θ 1 + μ$
Show answer
Answer: A
Q342022 · 27 Jul 2022 · Shift 2
A block 'A' takes $2 s$ to slide down a frictionless incline of $3 0^{\circ}$ and length 'l', kept inside a lift going up with uniform velocity 'v'. If the incline is changed to $4 5^{\circ}$ , the time taken by the block, to slide down the incline, will be approximately :
1. A. $2.66 s$
2. B. $0.83 s$
3. C. $1.68 s$
4. D. $0.70 s$
Show answer
Answer: C
Q572022 · 27 Jul 2022 · Shift 2· Numerical answer
A wire of length $30 cm$ , stretched between rigid supports, has it's $n^{th}$ and $(n + 1)^{th}$ harmonics at $400 Hz$ and $450 Hz$ , respectively. If tension in the string is $2700 N$ , it's linear mass density is ____ $kg/m$ .
Show answer
Answer: 3
Q592022 · 27 Jul 2022 · Shift 2· Numerical answer
Show answer
Answer: 120
Q602022 · 27 Jul 2022 · Shift 2· Numerical answer
Show answer
Answer: 2
Q312022 · 26 Jul 2022 · Shift 1
1. A. $3360 N$
2. B. $3380 N$
3. C. $3120 N$
4. D. $3240 N$
Show answer
Answer: A
Q362022 · 30 Jun 2022 · Shift 1
1. A. $10 N$
2. B. $20 N$
3. C. $25 N$
4. D. $45 N$
Show answer
Answer: D
Q372022 · 30 Jun 2022 · Shift 1
Two bodies A and B of masses 5 kg and 8 kg are moving such that the momentum of body B is twice that of the body A. The ratio of their kinetic energies will be :
1. A.4 : 5
2. B.2 : 5
3. C.5 : 4
4. D.5 : 2
Show answer
Answer: B
Q332022 · 28 Jun 2022 · Shift 2
A block of mass $2 kg$ moving on a horizontal surface with speed of $4 ms^{- 1}$ enters a rough surface ranging from $x = 0.5 m$ to $x = 1.5 m$ . The retarding force in this range of rough surface is related to distance by $F = - k x$ where $k = 12 Nm^{- 1}$ . The speed of the block as it just crosses the rough surface will be :
1. A.zero
2. B. $1.5 ms^{- 1}$
3. C. $2.0 ms^{- 1}$
4. D. $2.5 ms^{- 1}$
Show answer
Answer: C
Q342022 · 28 Jun 2022 · Shift 2
1. A. $\frac{6}{110}$
2. B. $\frac{3}{113}$
3. C. $\frac{3}{109}$
4. D. $\frac{2}{109}$
Show answer
Answer: C
Q592022 · 28 Jun 2022 · Shift 2· Numerical answer
Show answer
Answer: 10
Q342022 · 27 Jun 2022 · Shift 1
1. A. $9.8 N$
2. B. $39.2 N$
3. C. $49 N$
4. D. $78.4 N$
Show answer
Answer: C
Q392022 · 27 Jun 2022 · Shift 1
The velocity of a small ball of mass ' $m$ ' and density $d_{1}$ , when dropped in a container filled with glycerin, becomes constant after some time. If the density of glycerin is $d_{2}$ , then the viscous force acting on the ball, will be :
1. A. $m g (1 - \frac{d _{1}}{d _{2}})$
2. B. $m g (1 - \frac{d _{2}}{d _{1}})$
3. C. $m g (\frac{d _{1}}{d _{2}} - 1)$
4. D. $m g (\frac{d _{2}}{d _{1}} - 1)$
Show answer
Answer: B
Q352022 · 27 Jun 2022 · Shift 2
A stone tied to a string of length $L$ is whirled in a vertical circle with the other end of the string at the centre. At a certain instant of time, the stone is at its lowest position and has a speed $u$ . The magnitude of change in its velocity, as it reaches a position where the string is horizontal, is $x (u^{2} - g L)$ . The value of $x$ is -
1. A. $3$
2. B. $2$
3. C. $1$
4. D. $5$
Show answer
Answer: B
Q522022 · 27 Jun 2022 · Shift 2· Numerical answer
Show answer
Answer: 3
Q342022 · 26 Jun 2022 · Shift 1
1. A.
2. B.
3. C.
4. D.
Show answer
Answer: C