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31 Year NEET Previous Year Questions: Motion in a Plane - 2


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30 Questions MCQ Test Physics Class 11 | 31 Year NEET Previous Year Questions: Motion in a Plane - 2

31 Year NEET Previous Year Questions: Motion in a Plane - 2 for NEET 2023 is part of Physics Class 11 preparation. The 31 Year NEET Previous Year Questions: Motion in a Plane - 2 questions and answers have been prepared according to the NEET exam syllabus.The 31 Year NEET Previous Year Questions: Motion in a Plane - 2 MCQs are made for NEET 2023 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for 31 Year NEET Previous Year Questions: Motion in a Plane - 2 below.
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31 Year NEET Previous Year Questions: Motion in a Plane - 2 - Question 1

The magnitudes of vectors are 3, 4 and 5 units respectively. If , thenthe angle between  and  is

Detailed Solution for 31 Year NEET Previous Year Questions: Motion in a Plane - 2 - Question 1

Given, 

 = 3

= 4

= 5

We have a relation,  

Squaring both side, we get 

⇒ (  ) = ()2

⇒( )2+ ()2 + 2 Cosθ = ()2

⇒ (3)2 + (4)2 + 2.3.4 Cosθ = (5)2

⇒ 9 + 16 + 24 Cosθ = 25

⇒ 24 Cosθ = 25

⇒ 24Cosθ = 25 - 25

⇒ θ = Cos-1 (0)

⇒ θ = 90°

i.e π/2

 

 

31 Year NEET Previous Year Questions: Motion in a Plane - 2 - Question 2

The angle between is θ.  The value of the triple product  is [1989]

Detailed Solution for 31 Year NEET Previous Year Questions: Motion in a Plane - 2 - Question 2

Note that . Hence their dot product is zero.

31 Year NEET Previous Year Questions: Motion in a Plane - 2 - Question 3

A bus is moving on a straight road towards north with a uniform speed of 50 km/hour turns through 90°. If the speed remains unchanged after turning, the increase in the velocity of bus in the turning process is [1989]

Detailed Solution for 31 Year NEET Previous Year Questions: Motion in a Plane - 2 - Question 3

 = 50 km h-1 due North;

 = 50 km h-1 due West. Angle between

= 50 km h-1  due South

∴ Change in velocity

= 70.7 km/h

The direction of this change in velocity is in South-West.

31 Year NEET Previous Year Questions: Motion in a Plane - 2 - Question 4

The maximum range of a gun of horizontal terrain is 16 km. If g = 10 ms–2, then muzzle velocity of a shell must be [1990]

Detailed Solution for 31 Year NEET Previous Year Questions: Motion in a Plane - 2 - Question 4

 = 16000 [16km = 16000m]

or  v = (16000g )½ = (16000 x10)½          

= 400 ms –1

31 Year NEET Previous Year Questions: Motion in a Plane - 2 - Question 5

Two bodies of same mass are projected with the same velocity at an angle 30° and 60° respectively. The ratio of their horizontal ranges will be[1990]

Detailed Solution for 31 Year NEET Previous Year Questions: Motion in a Plane - 2 - Question 5

Horizontal range is same when angle of projection is θ or (90° – θ).

31 Year NEET Previous Year Questions: Motion in a Plane - 2 - Question 6

An electricfan has blades of length 30cm measured from the axis of rotation. If the fan is rotating at 120 rpm, the acceleration of a point on the tip of the blade is [1990]

Detailed Solution for 31 Year NEET Previous Year Questions: Motion in a Plane - 2 - Question 6

31 Year NEET Previous Year Questions: Motion in a Plane - 2 - Question 7

When milk is churned, cream gets separated due to[1991]

Detailed Solution for 31 Year NEET Previous Year Questions: Motion in a Plane - 2 - Question 7

Cream gets separated from a churned milk due to centrifugal force.

31 Year NEET Previous Year Questions: Motion in a Plane - 2 - Question 8

The resultant of will be equal to [1992]

Detailed Solution for 31 Year NEET Previous Year Questions: Motion in a Plane - 2 - Question 8

When a vector is multiplied with a scalar, the result is a vector.

31 Year NEET Previous Year Questions: Motion in a Plane - 2 - Question 9

If a body  A  of mass  M  is thrown with velocity v  at an 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 horizontal range of A to B will be [1992]

Detailed Solution for 31 Year NEET Previous Year Questions: Motion in a Plane - 2 - Question 9

Horizontal range is same wh en an gle of projection with the horizonatal is θ and (90° – θ).

31 Year NEET Previous Year Questions: Motion in a Plane - 2 - Question 10

A boat is sent across a river with a velocity of 8 km h–1. If the resultant velocity of boat is 10 km h–1 , then the velocity of the river is [1993]

Detailed Solution for 31 Year NEET Previous Year Questions: Motion in a Plane - 2 - Question 10

= 6 km h –111.  

31 Year NEET Previous Year Questions: Motion in a Plane - 2 - Question 11

A body constrained to move in y-direction, is subjected to a force given  by . What is the workdone by this force in moving the body through a distance of 10m along y-axis ? [1994]

Detailed Solution for 31 Year NEET Previous Year Questions: Motion in a Plane - 2 - Question 11

Since displacement is along the y-direction, hence displacement  

Work done

31 Year NEET Previous Year Questions: Motion in a Plane - 2 - Question 12

When a body moves with a constant speed along a circle[1994]

Detailed Solution for 31 Year NEET Previous Year Questions: Motion in a Plane - 2 - Question 12

On circular motion, the force acts along the radius and displacement at a location is perpendicular to the radius i.e., θ = 90° As work done = 

31 Year NEET Previous Year Questions: Motion in a Plane - 2 - Question 13

Th e position vector of a par ticle is . The velocity of the particle is [1995]

Detailed Solution for 31 Year NEET Previous Year Questions: Motion in a Plane - 2 - Question 13

Slope of position vector =  & slope of velocity vector

∴  velocity is perpendicular to the displacement.

31 Year NEET Previous Year Questions: Motion in a Plane - 2 - Question 14

Which of the following is not a vector quantity?

Detailed Solution for 31 Year NEET Previous Year Questions: Motion in a Plane - 2 - Question 14

A vector quantity has both magnitude and direction. In the given options, speed has only magnitude, therefore, it is non- vector or scalar quantity.

31 Year NEET Previous Year Questions: Motion in a Plane - 2 - Question 15

A bullet is fired from a gun with a speed of 1000 m/s in order to hit a target 100 m away. At what height above the target should the gun be aimed? (The resistance of air is negligible and g = 10 m/s2) [1995]

Detailed Solution for 31 Year NEET Previous Year Questions: Motion in a Plane - 2 - Question 15

Speed of the bullet (v) = 1000 m/s and horizontal distance of the target (s) = 100 m.
Time taken to cover the horizontal distance

During this time, the bullet will fall down vertically due to gravitational acceleration.

31 Year NEET Previous Year Questions: Motion in a Plane - 2 - Question 16

A body is whirled in a horizontal circle of radius 20 cm. It has an angular velocity of 10 rad/s.What is its linear velocity at any point on circular path[1996]

Detailed Solution for 31 Year NEET Previous Year Questions: Motion in a Plane - 2 - Question 16

Radius of circular path = 20 cm = 

Angular speed of body = 10 rad/s

Linear velocity = radius × Angular speed

31 Year NEET Previous Year Questions: Motion in a Plane - 2 - Question 17

A ball whose kinetic energy is E, is thrown at an angle of 45º with the horizontal. Its kinetic energy at the highest point of its flight will be [1997]

Detailed Solution for 31 Year NEET Previous Year Questions: Motion in a Plane - 2 - Question 17

Kinetic energy is E

Velocity at highest point

[∴ at the highest point there is only horizontal velocity]

K.E. at highest point

31 Year NEET Previous Year Questions: Motion in a Plane - 2 - Question 18

Find the torque of a force acting at the poin . [1997]

Detailed Solution for 31 Year NEET Previous Year Questions: Motion in a Plane - 2 - Question 18

31 Year NEET Previous Year Questions: Motion in a Plane - 2 - Question 19

Two particles A an d B are con nected by a rigid rod AB. The rod slides along perpendicular rails as shown here. The velocity of A to the left is 10 m/s. What is the velocity of B when angle α = 60º? [1998]

Detailed Solution for 31 Year NEET Previous Year Questions: Motion in a Plane - 2 - Question 19

Let after 1 sec angle become 60°. When the end A moves by 10 m left, the end B moves upward by BB' =    = 17.3 m/s

31 Year NEET Previous Year Questions: Motion in a Plane - 2 - Question 20

A ball of mass 0.25 kg attached to the end of a string of length 1.96 m is moving in a horizontal circle. The string will break if the tension is more than 25 N. What is the maximum speed with which the ball can be moved? [1998]

Detailed Solution for 31 Year NEET Previous Year Questions: Motion in a Plane - 2 - Question 20

31 Year NEET Previous Year Questions: Motion in a Plane - 2 - Question 21

A 500 kg car takes a round turn of radius 50 m with a velocity of 36 km/h. The centripetal force is[1999]

Detailed Solution for 31 Year NEET Previous Year Questions: Motion in a Plane - 2 - Question 21

 V =36km/h=10m/s

Centripetal force

= 1000 N
 

31 Year NEET Previous Year Questions: Motion in a Plane - 2 - Question 22

What is the linear velocity if angular velocity vect or  and position vector [1999]

Detailed Solution for 31 Year NEET Previous Year Questions: Motion in a Plane - 2 - Question 22

As we know that

31 Year NEET Previous Year Questions: Motion in a Plane - 2 - Question 23

The angle between two vectors of magnitude 12 and 18 units when their resultant is 24 units, is[1999]

Detailed Solution for 31 Year NEET Previous Year Questions: Motion in a Plane - 2 - Question 23

We know that, R2 = A2 + B2 + 2 AB cosθ
(24)2 = (12)2 + (18)2 + 2(12)(18) cos θ

31 Year NEET Previous Year Questions: Motion in a Plane - 2 - Question 24

A body of mass 0.4 kg is whi rled in a vertical circle making 2 rev/sec. If the radius of the circle is 1.2 m, then tension in the string when the body is at th e top of the circle, is [1999]

Detailed Solution for 31 Year NEET Previous Year Questions: Motion in a Plane - 2 - Question 24

Given : Mass (m) = 0.4 kg Its frequency (n) = 2 rev/sec Radius (r) =1.2 m.

We know that linear velocity of the body (v) = ωr = (2πn)r                

= 2 × 3.14 × 1.2 × 2 = 15.08 m/s.

Therefore, tension in the string when the body is at the top of the circle (T)

= 45.78 - 3.92 = 41.56 N

31 Year NEET Previous Year Questions: Motion in a Plane - 2 - Question 25

A stone tied with a string, is rotated in a vertical circle. The minimum speed with which the string has to be rotated [1999]

Detailed Solution for 31 Year NEET Previous Year Questions: Motion in a Plane - 2 - Question 25

Minimum speed with which the string is rotating in a vertical circle (v) = The minimum speed of stone is independent of mass of stone.

31 Year NEET Previous Year Questions: Motion in a Plane - 2 - Question 26

A person swims in a river aiming to reach exactly opposite point on the bank of a river. His speed of swimming is 0.5 m/s at an angle 120º with the direction of flow of water. The speed of water in stream is [1999]

Detailed Solution for 31 Year NEET Previous Year Questions: Motion in a Plane - 2 - Question 26

 

Velocity of person 

31 Year NEET Previous Year Questions: Motion in a Plane - 2 - Question 27

If a unit vector is represented by , the value of c is [1999]

Detailed Solution for 31 Year NEET Previous Year Questions: Motion in a Plane - 2 - Question 27

31 Year NEET Previous Year Questions: Motion in a Plane - 2 - Question 28

Two projectiles ar e fir ed from t he same point with the same speed at angles of projection 60º and 30º respectively. Which one of the following is true? [2000]

Detailed Solution for 31 Year NEET Previous Year Questions: Motion in a Plane - 2 - Question 28

Given, u1 = u2 = u, θ1 = 60º, θ2 = 30º In 1st case, we know that range

In 2nd case, when θ2 = 30º, then

[we get same value of ranges].

31 Year NEET Previous Year Questions: Motion in a Plane - 2 - Question 29

A small sphere is attach ed to a cord and rotates in a vertical circle about a point O. If the average speed of the sphere is increased, the cord is most likely to break at the orientation when the mass is at [2000]

Detailed Solution for 31 Year NEET Previous Year Questions: Motion in a Plane - 2 - Question 29

In the case of a body describing a vertical circle,

Tension is maximum when cosθ = +1 and velocity is maximum Both conditions are satisfied at θ = 0º (i.e. at lowest point B]

31 Year NEET Previous Year Questions: Motion in a Plane - 2 - Question 30

 A particle moves with a velocity  under the in fluence of a constant force The instantaneous power applied to the particle is [2000]

Detailed Solution for 31 Year NEET Previous Year Questions: Motion in a Plane - 2 - Question 30

   = 6 × 20 – 4 × 15 –3 ×5 = 45 J/s

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