Here, you will get Class 11 Physics MCQ of Chapter 4 Motion in a Plane for cracking JEE and NEET/AIIMS. By solving these MCQs of Class 11 Physics Chapter 4 Motion in a Plane, you will get the confidence to crack JEE or NEET. Practice **MCQ Questions for Class 11 Physics** with Answers on a daily basis and score well in exams.

## Motion In A Plane Class 11 MCQs Questions with Answers

**When a body P moves on a circular path, the centripetal acceleration is**

(a) directed inwards from P, to the centre of the circle

(b) directed tangential to the circumference of the circle, at P

(c) directed perpendicular to the plane of the circle, at P

(d) directed outward, perpendicular to the circumference of the circle

Answer: (a) directed inwards from P, to the centre of the circle)

**A body is moving along a circular path with variable speed, it has**(a) A radical acceleration

(b) A tangential acceleration

(c) Zero acceleration

(d) Both radical and tangential acceleration

Answer: (d) Both radical and tangential acceleration

**A car sometimes overturns while taking a turn. When it overturns, it is**(a) The inner wheel which leaves the ground first

(b) The outer wheel which leaves the ground first

(c) both the wheel leave the ground simultaneously

(d) Either inner wheel or the outer wheel leaves the ground

Answer: (a) The inner wheel which leaves the ground first

**A particle is acted upon by a force of constant magnitude which is always perpendicular to the velocity of the particle? The motion takes place in a plane. It follows that**(a) its velocity is constant

(b) its acceleration is constant

(c) its motion is linear

(d) its motion is circular

Answer: (d) its motion is circular)

**In a vertical circle of radius r at what point in its path, a particle has a tension equal to zero?**(a) Highest point

(b) Lowest point

(c) Any point

(d) A horizontal point

Answer: (a) Highest point

**When a disc containing mercury and water is rotated rapidly about a vertical axis, then the outermost place in the disc will be taken by:**(a) water

(b) mercury

(c) sometimes water and sometimes mercury

(d) none of these.

Answer: (b) mercury

**How many minimum number of vectors in different planes can be added to give zero resultant?**(a) 4

(b) 5

(c) 3

(d) 2

Answer: (a) 4

**A body of mass 500 gram is rotating in a vertical circle of radius 1 m. What is the difference in its kinetic energies at the top and the bottom of the circle?**(a) 4.9 J

(b) 19.8 J

(c) 2.8 J

(d) 9.8 J

Answer: (d) 9.8 J

**Two vectors A and B lie in a plane, a third vector C lies outside this plane, the sum of these vectors A + B + C**(a) can never be zero

(b) can be zero

(c) Both

(d) None of these

Answer: (a) can never be zero

**One° (1°) is equal to?**(a) 0.1745 rad

(b) 0.01745 rad

(c) 0.001745 rad

(d) 7.1745 rad

Answer: (b) 0.01745 rad

**A cyclotron can be used to produce high energy:**(a) neutrons

(b) deutrons

(c) β particles

(d) α particles

Answer: (d) α particles

**The radius of the trajectory of a charged particle in a uniform magnetic field is proportional to the:**(a) charge on the particle

(b) energy of the particle

(c) momentum of the particle

(d) all the above

Answer: (c) momentum of the particle

**A body is traveling in a circle at constant speed. It**(a) has an inward acceleration

(b) has constant velocity.

(c) has no acceleration

(d) has an outward radial acceleration

Answer: (a) has an inward acceleration

**Which of the following conditions are sufficient and essential for a quantity to be a vector?**(a) Magnitude, direction, and addition, subtraction multiplication and division by vector laws

(b) Magnitude, direction and combination of vectors by ordinary rules of algebra

(c) Magnitude and addition, subtraction, multiplication by ordinary rules of algebra

(d) Magnitude and direction

Answer: (a) Magnitude, direction, and addition, subtraction multiplication and division by vector laws

**How many minimum number of vectors in different planes can be added to give zero resultant?**(a) 4

(b) 5

(c) 3

(d) 2

Answer: (a) 4

**Three vectors A, B and C satisfy the relation A.B = 0 and A.C = 0. The vector A is parallel to**(a) B

(b) C

(c) B × c

(d) B.C

Answer: (c) B × c

**The resultant of two forces P and Q is R. If one of the forces is reversed in direction, then the resultant becomes S. Then for the identity R² + S² = 2(P² + Q²) to hold good**(a) The forces are collinear

(b) The forces act as right angles to each other

(c) The forces are inclined at 45° to each other

(d) The forces can have any angle of inclination between them

Answer: (d) The forces can have any angle of inclination between them

**Two bullets are fired simultaneously horizontally and with different speeds from the same place. Which bullet will hit the ground first?**(a) The slower one

(b) The faster one

(c) Both will reach simultaneously

(d) Depends on the masses

Answer: (c) Both will reach simultaneously

**The muzzle speed of a certain rifle is 330 ms ^{-1}. At the end of one second, a bullet fired straight up into the air will travel a distance of:**(a) 330 m

(b) (330 – 4.9) m

(c) (330 – 9.8) m

(d) (330 + 4.9) m

Answer: (b) (330 – 4.9) m

**If a body A of mass M is thrown with velocity v at angle of 30° to the horizontal and another body B of the same mass is thrown with the same speed at an angle of 60° to the horizontal, the ratio of the horizontal ranges of A and B will be**(a) 1 : 3

(b) 1 : 1

(c) √3 : 1

(c) 1 : √3

Answer: (b) 1 : 1

**A cyclist goes round a circular path of circumference 343 m in s. The angle made by him, with the vertical is**(a) 440

(b) 420

(c) 430

(d) 450

Answer: (d) 450

**A coin kept on a rotating gramophone disc just begins to slip if its centre is at a distance of 8 cm from the centre of the disc. The angular velocity of the gramophone disc is then doubled. Through what distance, the coin should be shifted towards the centre, so that the coin will just slip?**(a) 2 cm

(b) 6 cm

(c) 16 cm

(d) 4 cm

Answer: (a) 2 cm

**The total flight requires a time that is?**(a) four times the time necessary to reach the maximum height.

(b) thrice the time necessary to reach the maximum height

(c) equal to the time necessary to reach the maximum height.

(d) twice the time necessary to reach the maximum height

Answer: (d) twice the time necessary to reach the maximum height

**The path of a particle is given by the expression y = at + bt², where a and b are constants . Y is the displacement at time t. Its velocity at any instant is given by**(a) a + 2bt

(b) zero

(c) 2bt

(d) at

Answer: (a) a + 2bt

**The path followed by a projectile is called its?**(a) Territory

(b) Treasury

(c) Tractor

(d) Trajectory

Answer: (d) Trajectory

**Which theorem states that “If a particle under the simultaneous action of three forces is in equilibrium, then each force has a constant ratio with the sine of the angle between the other two forces”?**(a)Lay’s theorem

(b)Lami’s Theorem

(c)Newton’s law

(d)Faraday’s theorem

Answer: (b) Lami’s Theorem

**Give an example of motion in two dimensions ———–**(a)Motion along a straight line in any direction

(b)Bird flying

(c)A flying kite

(d)Projectile motion

Answer: (d) Projectile motion

**Motion in a plane is called**(a)Motion in one dimension

(b)Motion in two dimensions

(c)Motion in three dimensions

(d)Motion in four dimensions

Answer: (b) Motion in two dimensions

**A projectile is projected with a linear momentum p making angle θ with the horizontal. The change in momentum of the projectile on return to the ground will be**(a) 2p

(b) 2p sin θ

(c) 2p tan θ

(d) 2p cos θ

Answer: (b) 2p sin θ

**A boat which has the speed of 5 kmh ^{-1} still water crosses a river of width 1 km along the shortest possible path in 15 minutes. The velocity of the river water is**(a) 3 kmh

^{-1}

(b) 4 kmh

^{-1}

(c) √41 kmh

^{-1}

(d) 1 kmh

^{-1}

Answer: (a) 3 kmh-1

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