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Physics: Topic-wise Test- 3 - NEET MCQ


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30 Questions MCQ Test - Physics: Topic-wise Test- 3

Physics: Topic-wise Test- 3 for NEET 2024 is part of NEET preparation. The Physics: Topic-wise Test- 3 questions and answers have been prepared according to the NEET exam syllabus.The Physics: Topic-wise Test- 3 MCQs are made for NEET 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Physics: Topic-wise Test- 3 below.
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Physics: Topic-wise Test- 3 - Question 1
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Which of the following physical quantities has a unit but no dimensions?

Detailed Solution for Physics: Topic-wise Test- 3 - Question 1

Among the given physical quantities angle has a unit but no dimensions. Angle = [M°L°T°]
The SI unit of angle is radian.

Physics: Topic-wise Test- 3 - Question 2
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Which of the following pairs of physical quantities have same dimensions?

Detailed Solution for Physics: Topic-wise Test- 3 - Question 2

we know, force = mass × acceleration
energy = Workdone = force × displacement
power = energy/time
torque = force × perpendicular distance between force and axis of rotation. now, by these formula, find dimension of all terms.
Example: dimension of force = [MLT⁻²]
dimension of energy = [ML²T⁻²]
dimension of power = [ML²T⁻³]
dimension of torque = [ML²T⁻²]
Here it is clear that dimension of energy and dimension of torque are equal.
Hence, option (b) is correct.

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Physics: Topic-wise Test- 3 - Question 3
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Which of the following statements is incorrect regarding significant figures?

Detailed Solution for Physics: Topic-wise Test- 3 - Question 3

The power of 10 is irrelevant to the determination of significant figures.

Physics: Topic-wise Test- 3 - Question 4
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The radius of a sphere is 1.41cm. Its volume to an appropriate number of significant figures is
Detailed Solution for Physics: Topic-wise Test- 3 - Question 4

Radius of the sphere, r = 1.41cm
(3 significant figures)
Volume of the sphere,

= 11.736 cm3
Rounded off upto 3 significant figures = 11.7 cm3.

Physics: Topic-wise Test- 3 - Question 5
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The mass of a box measured by a grocer's balance is 2.3 kg. Two gold pieces of masses 20.15 g and 20.17 g are added to the box. The total mass of the box is:
Detailed Solution for Physics: Topic-wise Test- 3 - Question 5

Here, mass of the box, m = 2.3 kg
Mass of one gold piece, m1 = 20.15 g = 0.02015 kg
Mass of other gold piece, m2 = 20.17 g = 0.02017 kg
∴ Total mass = m + m1 + m2
= 2.3 kg + 0.02015 kg + 0.02017 kg = 2.34032 kg
As the result is correct only upto one place of decimal, therefore, on rounding off, we get
Total mass = 2.3 kg

Physics: Topic-wise Test- 3 - Question 6
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A truck is coming towards you from a distance of 1000m on a straight road, at time t=0. It reaches you in 100sec. The average speed in m/s is
Detailed Solution for Physics: Topic-wise Test- 3 - Question 6

Physics: Topic-wise Test- 3 - Question 7
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A stone thrown from the top of a building is given an initial velocity of 20.0 m/s straight upward. Determine the time in seconds at which the stone reaches its maximum height.

g =9.8 m / sec2
Detailed Solution for Physics: Topic-wise Test- 3 - Question 7

Physics: Topic-wise Test- 3 - Question 8
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A truck covers 40.0 m in 8.50 s while smoothly slowing down to a final speed of 2.80 m/s. Find its acceleration in m/s2
Detailed Solution for Physics: Topic-wise Test- 3 - Question 8

Physics: Topic-wise Test- 3 - Question 9
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Path length is defined as.
Detailed Solution for Physics: Topic-wise Test- 3 - Question 9

Explanation:Path length is defined as the total length of the path traversed by an object.

Unlike displacement, which is the total distance an object travels from a starting point, path length is the total distance travelled, regardless of where it travelled.

Physics: Topic-wise Test- 3 - Question 10
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A truck is coming towards you from a distance of 1000m on a straight road, at time t=0. The driver stops for a second near a poster. He reaches you in 100 sec. The average speed in m/s is
Detailed Solution for Physics: Topic-wise Test- 3 - Question 10

Physics: Topic-wise Test- 3 - Question 11
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A stone thrown from the top of a building is given an initial velocity of 20.0 m/s straight upward. Determine the maximum height it travels in meters. g =9.8 m / sec2
Detailed Solution for Physics: Topic-wise Test- 3 - Question 11

Explanation:

Initial velocity u = 20.0 m/s

At maximum height stone will  be stopped, 

So final velocity v = 0 m/s

Acceleration due to gravity
a = g = -9.8 m/s​​​​​​2 (-ve Because it is in opposite direction of motion)

Let maximum height = s

We know,

Physics: Topic-wise Test- 3 - Question 12
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A person moves 30 m north, then 30 m east, then 30√2​ m  south-west. His displacement from the original position is:
Detailed Solution for Physics: Topic-wise Test- 3 - Question 12

Resolving displacement 30√2 m south-west into two rectangular components, we get
Displacement in south

∴ Effective displacement due to 30 m north and 30 m south is zero.
Also effective displacement due to 30 m east and 30 m west in zero.

Physics: Topic-wise Test- 3 - Question 13
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A bird flies from (-3m, 4m, -3m) to (7m, -2m, -3m) in the xyz- coordinates. The bird's displacement vector is given by
Detailed Solution for Physics: Topic-wise Test- 3 - Question 13

Physics: Topic-wise Test- 3 - Question 14
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On an open ground, a motorist follows a track that turns to his left by an angle of 60° after every 500 m. Starting from a given turn, the displacement of the motorist at the third turn is
Detailed Solution for Physics: Topic-wise Test- 3 - Question 14

The path followed by the motorist is a regular hexagon ABCDEF of side 500 m, as shown in the given figure. Let the motorist starts from A and takes the third turn at D.
image
Therefore, the magnitude of this displacement is 
​AD = AG + GD = 500 m + 500 m = 1000 m 

Physics: Topic-wise Test- 3 - Question 15
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Rain falls at a speed of 50m/s and a child walks on a straight road from east to west at a speed of 100m/s. To find the direction in which the child should hold the umbrella use
Detailed Solution for Physics: Topic-wise Test- 3 - Question 15

The child should hold the umbrella in the direction at which the rain appears to fall on him, which is the direction of relative speed of rain with respect to the  child.

Physics: Topic-wise Test- 3 - Question 16
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 Which of the following quantity does not remain constant during the uniform circular motion?
Detailed Solution for Physics: Topic-wise Test- 3 - Question 16
  1. Linear momentum is not constant but angular momentum is
  2. Speed has to be constant for “uniform” circular motion
  3. For obvious reasons ω is constant
  4. And the same goes for α
Physics: Topic-wise Test- 3 - Question 17
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Two stones of different masses are thrown vertically upward with same initial velocity. Which one will rise to a greater height ?
Detailed Solution for Physics: Topic-wise Test- 3 - Question 17

If we write the equation of motion for both the masses and derive a simple equation to find the maximum vertical height let say H, we get for any particle for some mass m,
H = v2 / 2a
Where a is gravitational acceleration and v is vertical speed. Thus as H does not depend upon m, we get both particles would have equal maximum height.

Physics: Topic-wise Test- 3 - Question 18
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The motion of a freely falling body is an example of:
Detailed Solution for Physics: Topic-wise Test- 3 - Question 18

A freely falling body observes a constant downwards force of gravity which hence applies a constant downward acceleration upon the body.

Physics: Topic-wise Test- 3 - Question 19
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A meter rule is supported at its centre. It is balanced by two weights, A and B. If A and B are placed at a distance 20 cm, and 40 cm from the centre of scale, find the weight of B. The weight of A is 50N.
Detailed Solution for Physics: Topic-wise Test- 3 - Question 19

In balanced condition torque of the both sides must be equal so Fa × Da = Fb × Db
50 × 20 = Fb × 40
Fb = 25 N

Physics: Topic-wise Test- 3 - Question 20
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 In order to rotate a body, we need to apply
Detailed Solution for Physics: Topic-wise Test- 3 - Question 20

In order to rotate a body, we need to apply two equal forces at two ends but in the opposite direction.

Physics: Topic-wise Test- 3 - Question 21
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There are two blocks of mass 3 kg and 5 kg hanging from the ends of a rod of negligible mass. The rod is marked in eight equal parts as shown. At which of the points indicated should a string be attached if a rod is to remain horizontal when suspended from the string?
    
Detailed Solution for Physics: Topic-wise Test- 3 - Question 21

This is based on torque balance, That is F.d=const.
Therefore 3×d=5×(8-d)
by solving we get d=5.
and at point 5=E

Physics: Topic-wise Test- 3 - Question 22
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A planet is moving in an elliptical path around the sun as shown in figure. Speed of planet in positional P and Q are υ1 and υ2 respectively with SP = r1 and SQ = r2 , then υ1/υ2 is equal to
Detailed Solution for Physics: Topic-wise Test- 3 - Question 22

Angular momentum of planet about the sun is constant.

i.e. mυr sin θ = constant

At position P and Q, θ = 900 and m = mass of planet = constant

∴ υr = constant

Physics: Topic-wise Test- 3 - Question 23
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Consider two configurations of a system of three particles of masses m, 2m and 3m. The work done by external agent in changing the configuration of the system from figure (i) to figure (ii) is

 
Physics: Topic-wise Test- 3 - Question 24
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Three particles P, Q and R placed as per given figure. Masses of P, Q and R are √3 m, √3 m and m respectively. The gravitational force on a fourth particle ‘S’ of mass m is equal to
Detailed Solution for Physics: Topic-wise Test- 3 - Question 24

in horizontal direction  

in vertical direction

Physics: Topic-wise Test- 3 - Question 25
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How much deep inside the earth should a man go so that his weight becomes one fourth of that at a point which is at a height R above the surface of earth .
Detailed Solution for Physics: Topic-wise Test- 3 - Question 25


 g=GM/r2                                                g1=GMr/R3
we are given that,
GMr/R3 =(1/4) GM/(R+R)2
=>r/R3=(1/4).(1/4R2)
=>r=R/6
Therefore, d=R-r=15R/16

Physics: Topic-wise Test- 3 - Question 26
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Three identical stars of mass M are located at the vertices of an equilateral triangle with slide L. The speed at which they will move if they all revolve under the influence of one another’s gravitational force in a circular orbit circumscribing the triangle while still preserving the equilateral triangle
Physics: Topic-wise Test- 3 - Question 27
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The period of revolution of planet A around the sun is 8 times that of B. The distance of A from the sun is x times that of B from the sun. Find x.
Detailed Solution for Physics: Topic-wise Test- 3 - Question 27

Since we know that and ATQ TA = 8TB so,
⇒ (Ta/Tb)2 = (Ra/Rb)3
⇒ 64 = x3
⇒ x = 4

Physics: Topic-wise Test- 3 - Question 28
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If an artificial satellite is moving in a circular orbit around the earth with a speed equal to half the magnitude of the escape velocity form the earth, the height of the satellite above the surface of the earth is
Detailed Solution for Physics: Topic-wise Test- 3 - Question 28

on solving we get;h = r

Physics: Topic-wise Test- 3 - Question 29
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A uniform ring of mass M and radius R is placed directly above uniform sphere of mass 8M and of same radius R. The centre of the ring is at a distance of d = √3R from the centre of sphere. The gravitational attraction between the sphere and the ring is
Detailed Solution for Physics: Topic-wise Test- 3 - Question 29

Gravitational field due to the ring  at a distance d = √3R on its axis is:

force on sphere

Physics: Topic-wise Test- 3 - Question 30
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An increase in temperature in a liquid would cause a phase change to which of the following?
Detailed Solution for Physics: Topic-wise Test- 3 - Question 30

Increasing the temperature of liquid, increases the average K.E. of the molecules. The molecules start moving vigorously in all the directions, thereby increasing and the inter-molecular space between them. Thus, the liquid changes into gas.

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