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NEET Practice Test - 21 - NEET MCQ


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30 Questions MCQ Test - NEET Practice Test - 21

NEET Practice Test - 21 for NEET 2024 is part of NEET preparation. The NEET Practice Test - 21 questions and answers have been prepared according to the NEET exam syllabus.The NEET Practice Test - 21 MCQs are made for NEET 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for NEET Practice Test - 21 below.
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NEET Practice Test - 21 - Question 1

If  are three non-zero vector. Such that is perpendicular tothen which of one is correct 

Detailed Solution for NEET Practice Test - 21 - Question 1

 


So A > B

NEET Practice Test - 21 - Question 2

What is the area of parallelogram whose diagonals are represented by 

Detailed Solution for NEET Practice Test - 21 - Question 2




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NEET Practice Test - 21 - Question 3

In the formula X =3YZ2 , X and Z have dimensions of capacitance and magnetic induction respectively. What are the dimensions of Y in MKSQ system? (Q = charge)

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NEET Practice Test - 21 - Question 4

A unitless quantity

NEET Practice Test - 21 - Question 5

Which pair of following quantities has dimensions different from each other?

NEET Practice Test - 21 - Question 6

The dimensions of 0 : permittivity of free space, E : electric field) is 

Detailed Solution for NEET Practice Test - 21 - Question 6

NEET Practice Test - 21 - Question 7

Pressure depends on distance as,   where α,β are constants, z is distance, k is Boltzmann’s constant and θ is temperature. The dimension of β are 

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NEET Practice Test - 21 - Question 8

What are the dimensions of electrical resistance?

Detailed Solution for NEET Practice Test - 21 - Question 8

v = IR
v hss the dimension of 

NEET Practice Test - 21 - Question 9

An ant is at a corner of a cubical room of side ‘a’. The ant can move with a constant speed u. The minimum time taken to reach the farthest corner of the cube is 

Detailed Solution for NEET Practice Test - 21 - Question 9


on placing back face and bottom face in same plane 

NEET Practice Test - 21 - Question 10

A particle is moving in a straight line with initial velocity u and uniform acceleration f. If the sum of the distances travelled in tth and (t + 1)th seconds is 100 cm, then its velocity after t seconds, in cm/s, is

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NEET Practice Test - 21 - Question 11

A ball is thrown vertically upwards from the ground. It crosses a point at the height of 25 m twice at an interval of 4 secs. The ball was thrown with the velocity of

Detailed Solution for NEET Practice Test - 21 - Question 11


25 = ut - 5t2
5t2 - ut = 25 = 0
Let t1, t2 be its roots
t1 + t2 = u/5, t1t2 = 5
Given, t2 - t1 = 4 sec.
(t2 - t1)2 = 16
⇒ (t2 - t1)2 - 4t1t2 = 16

u = 30 m/sec.

NEET Practice Test - 21 - Question 12

A parachutist drops freely from an aeroplane for 10 s before the parachute opens out. Then he descends with a net retardation of 2.5 ms-2. If he balls out of the plane at a height of 2495 m and g = 10 ms-2, his velocity on reaching the ground will be

Detailed Solution for NEET Practice Test - 21 - Question 12

Distance covered in first 10 sec 

Remaining height from ground = 2495 - 500 = 1995 m
velocity on reaching the ground

NEET Practice Test - 21 - Question 13

The velocity of a car moving on a straight road increases linearly according to equation, v = a + bx, where a & b are positive constants. The acceleration in the course of such motion: (x is the displacement)

Detailed Solution for NEET Practice Test - 21 - Question 13

V = + bx
(V increases as x increases)

So, acceleration 

NEET Practice Test - 21 - Question 14

The position vector of a particle is given The time after which the velocity vector and acceleration vector becomes perpendicular to each other is equal to 

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NEET Practice Test - 21 - Question 15

The retardation experienced by a moving motor boat after its engine is cut off is given by: , where k is a + ve constant. If vo is the magnitude of velocity at cut off, the magnitude of the velocity at time t after the cut off is 

Detailed Solution for NEET Practice Test - 21 - Question 15

NEET Practice Test - 21 - Question 16

A bird flies for 4 seconds with a velocity of |t – 2| m/sec. In a straight line, where t = time in seconds. It covers a distance of

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Plotting velocity v against time t, we get  Area under the v–t curve gives distance

NEET Practice Test - 21 - Question 17

The graph shown in the figure shows the velocity v versus time t of a body. Which of the graphs shown in figure represents the corresponding acceleration versus time graphs? 

Detailed Solution for NEET Practice Test - 21 - Question 17


Instantaneous, acceleration = slope of v–t graph  Hence, obviously, a – t graph will be as shown,

NEET Practice Test - 21 - Question 18

A body is projected with a speed u at an angle to the horizontal to have maximum range. At the highest point the speed is 

Detailed Solution for NEET Practice Test - 21 - Question 18

For maximum range, θ = 45º 
At the highest point, 

NEET Practice Test - 21 - Question 19

Ratio of the ranges of the bullets fired from a gun (of constant muzzle speed) at angle θ,2θ & 4θ is found in the ratio x : 2 : 2, then the value of x will be (Assume same muzzle speed of bullets) 

Detailed Solution for NEET Practice Test - 21 - Question 19

Range is same for 2θ and 4θ
∴ 2θ + 4θ = 90° ⇒ θ = 15°
∴ Ratio of ranges will be sin 30° : sin 60° : sin 120°

NEET Practice Test - 21 - Question 20

A stone projected at angle 'θ' with horizontal from the roof of a tall building falls on the ground after three second. Two second after the projection it was again at the level of projection. Then the height of the building is  

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NEET Practice Test - 21 - Question 21

The vertical height of the projectile at time t is given by y =4t− t2 and the horizontal distance covered is given by x =3t . What is the angle of projection with the horizontal? 

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NEET Practice Test - 21 - Question 22

A stone projected at an angle of 60o from the ground level strikes at an angle of 30o on the roof of a building of height ‘h’. Then the speed of projection of the stone is 

Detailed Solution for NEET Practice Test - 21 - Question 22

Let initial and final speeds of stone be u and v
∴ v2 = u2 – 2gh   …(i)
 and v cos 30º = u cos 60º  …(ii) 
solving 1 and 2 we get 

NEET Practice Test - 21 - Question 23

A man holding a flag is running in North-East direction with speed 10 m/s. Wind is blowing in east direction with speed . Find the direction in which flag will flutter (w.r.t. man) 

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The flag will flutter in the direction in which wind is blowing with respect to the man holding the flag. 


This implies direction of wind with respect to man in south. Flag will flutter in south direction.  

NEET Practice Test - 21 - Question 24

A particle is projected at angle 60o with speed from the point ‘A’ as shown in the figure. At the same time the wedge is made to move with speed towards right as shown in the figure. Then the time after which particle will strike with wedge is (g = 10 m/sec2). 

Detailed Solution for NEET Practice Test - 21 - Question 24



⇒ t = 2 sec.

NEET Practice Test - 21 - Question 25

A lift is moving in upward direction with speed 20 m/s and having acceleration 5 m/s2 in downward direction. A bolt drops from the ceiling of lift at that moment. Just after the drop, the

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The velocity of an object released in a moving frame is equal to that of the frame as observed from the frame 

NEET Practice Test - 21 - Question 26

At a harbour, a boat is standing and wind is blowing at a speed of due to which, the flag on the boat flutters along north-east. Now the boat enters in to river, which is flowing with a velocity of 2 m/sec due north. The boat starts with zero velocity relative to the river and its constant acceleration relative to the river is 0.2 m/sec2 due east. In which direction will the flag flutter at 10 seconds?

Detailed Solution for NEET Practice Test - 21 - Question 26



So, the flag will flutter towards south-west. 

NEET Practice Test - 21 - Question 27

A man crosses the river perpendicular to river flow in time t seconds and travels an equal distance down the stream in T seconds. The ratio of man’s speed in still water to the speed of river water will be 

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Let velocity of man in still water be v and that of water with respect to ground be u. Velocity of man perpendicular to river flow with respect to ground 

Velocity of man downstream = v + u 

NEET Practice Test - 21 - Question 28

A particle is moving in a straight line whose acceleration versus time graph is given. Assume that initial velocity is in the direction of acceleration. Then which of the statement is correct between time t = 0 to t = to.  

Detailed Solution for NEET Practice Test - 21 - Question 28

It is clear from the figure that acceleration does not change sign, i.e., does not change in direction. Only the
∴ Velocity keeps on increasing.
Hence displacement also keeps on increasing.

NEET Practice Test - 21 - Question 29

Two boats A and B having same speed relative to river are moving in a river. Boat A moves normal to the river current as observed by an observer moving with velocity of river current. Boat B moves normal to the river as observed by the observer on the ground.  

Detailed Solution for NEET Practice Test - 21 - Question 29

(Moderate) Speed of river is u and speed of boat relative to water is v. 
Speed of boat B observed from ground 
Speed of boat B observed from ground 

From river frame, speed of boat A and B will be same.

NEET Practice Test - 21 - Question 30

A train is standing on a platform, a man inside a compartment of a train drops a stone. At the same instant train starts to move with constant acceleration. The path of the particle as seen by the person who drops the stone is  

Detailed Solution for NEET Practice Test - 21 - Question 30

Relative to the person in the train, acceleration of the stone is ‘g’ downward, a (acceleration of train) backwards. 

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