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SRMJEEE Physics Mock Test - 9 - JEE MCQ


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30 Questions MCQ Test - SRMJEEE Physics Mock Test - 9

SRMJEEE Physics Mock Test - 9 for JEE 2024 is part of JEE preparation. The SRMJEEE Physics Mock Test - 9 questions and answers have been prepared according to the JEE exam syllabus.The SRMJEEE Physics Mock Test - 9 MCQs are made for JEE 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for SRMJEEE Physics Mock Test - 9 below.
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SRMJEEE Physics Mock Test - 9 - Question 1

The ratio of secondary to the primary turns in a transformer is 3:2. If the power output be P, then the input power neglecting all loses must be equal to

SRMJEEE Physics Mock Test - 9 - Question 2

The rate of disintegration of fixed quantity of a radioactive element can be increased by

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SRMJEEE Physics Mock Test - 9 - Question 3

In an A.C. circuit, the current is i = 5 sin (100t-π/2) amp and the a.c. potential is V = 200 sin (100t) volt. Then, the power consumption is

SRMJEEE Physics Mock Test - 9 - Question 4

Which one is not the correct statement?

SRMJEEE Physics Mock Test - 9 - Question 5

An oxide coated filament is useful in vacuum tubes because essentially

SRMJEEE Physics Mock Test - 9 - Question 6

The coefficient of linear expansion of brass and steel are α₁ and α₂. If we take a brass rod of length l₁ and steel rod of length l₂ at 0°C, their difference in length (l₂-l₁) will remain the same at a temperature if

SRMJEEE Physics Mock Test - 9 - Question 7

A small solid cylinder rolls up along a curved surface (fig.) with an initial velocity v. It will ascend up to a height ‘h’ equal to

SRMJEEE Physics Mock Test - 9 - Question 8

Consider the following statements regarding the magnitude of barrier potential of a PN junction:
1. It is independent of temperature
2. It depends on difference between fermi levels on two sides of junction.
3. It depends on forbidden energy gap on two types of semiconductors
4. It depends on impurity concentration in P and N type semiconductors
Which of the statements given above is/are correct?

SRMJEEE Physics Mock Test - 9 - Question 9

A shell is fired from a canon with velocity v m/sec at an angle θ with the horizontal direction. At the highest point in its path it explodes into two pieces of equal mass. One of the pieces retraces its path to the cannon and the speed in m/sec of the other piece immediately after the explosion is

Detailed Solution for SRMJEEE Physics Mock Test - 9 - Question 9

Let '2m' be the mass of the cannon which is projected with velocity 'v' at an angle 'θ' with the horizontal direction
The horizontal component of the velocity of the cannon is, vx = v cosθ.
This component remains constant
At the maximum height, the cannon has only this component as the vertical component is momentarily zero

So, momentum before exploding = 2mv cosθ
After exploding one of the masses retraces the path of the cannon backwards
This is possible on if the part has velocity '-v cosθ'
Therefore, momentum after explosion = -mv cosθ + mu
So, by conservation of momentum
2mv cosθ = -mv cosθ + mu
⇒ u = (3v cosθ) m/s

SRMJEEE Physics Mock Test - 9 - Question 10

A body of mass 5kg rests on a rough horizontal surface of coefficient of friction 0.2. The body is pulled through a distance of 10m by a horizontal force 25N. The kinetic energy acquired by it is (g = 10 ms−2)

SRMJEEE Physics Mock Test - 9 - Question 11

The figure shows a charge q placed inside a cavity in an uncharged conductor. Now if an external electric field is switched on:

SRMJEEE Physics Mock Test - 9 - Question 12

If the earth rotates faster than its present speed, then weight of an object will

SRMJEEE Physics Mock Test - 9 - Question 13

The temperature of a body falls from 50°C to 40°C in 10 minutes. If the temperature of the surroundings is 20°C Then temperature of the body after another 10 minutes will be

SRMJEEE Physics Mock Test - 9 - Question 14

The translational kinetic energy of gas molecule for one mole of the gas is equal to

SRMJEEE Physics Mock Test - 9 - Question 15

The electric current in a circular coil of two turns produced a magnetic induction of 0.2T at its centre. The coil is unwound and is rewound into a circular coil of four turns. The magnetic induction at the centre of the coil now is, in tesla (if same current flows in the coil)

SRMJEEE Physics Mock Test - 9 - Question 16

A satellite in a force-free space sweeps stationary interplanetary dust at a rate (dM/dt) = αν. The acceleration of satellite is

SRMJEEE Physics Mock Test - 9 - Question 17

A vibration magnetometer is placed at South pole, then the time period will be

SRMJEEE Physics Mock Test - 9 - Question 18

Hydraulic press is based on

SRMJEEE Physics Mock Test - 9 - Question 19

A particle experiences a constant acceleration for 20 sec after starting from rest. If it travels a distance S₁ in the first 10 sec and a distance S₂ in the next 10 sec, then

SRMJEEE Physics Mock Test - 9 - Question 20

When forces F1, F2, F3 are acting on a particle of mass m such that F2 and F3 are mutually perpendicular, then the particle remains stationary. If the force F1 is now removed, then the acceleration of the particle is

Detailed Solution for SRMJEEE Physics Mock Test - 9 - Question 20

The particle remains stationary on the application of three forces that means the resultant force is 0.
This implies
F1 = - (F2 + F3)
Since, if the force F1 is removed, the forces acting are F2 and F3, the resultant of which has the magnitude of F1.
Therefore, the acceleration of the particle is F1 /m

SRMJEEE Physics Mock Test - 9 - Question 21

A second's pendulum is mounted in a rocket. Its period of oscillation decreases when the rocket

SRMJEEE Physics Mock Test - 9 - Question 22

A particle is viberating in a simple harmonic motion with an amplitude of 4 cm. At what displacement from the equilibrium position, is its energy half potential and kinetic ?

SRMJEEE Physics Mock Test - 9 - Question 23

A body is projected at such an angle that the horizontal range is three times the greatest height. The angle of projection is

SRMJEEE Physics Mock Test - 9 - Question 24

A hole in the bottom of the tank having water. If total pressure at bottom is 3 atm, then velocity of water flowing from hole is

SRMJEEE Physics Mock Test - 9 - Question 25

A symmetric double convex lens is cut in two equal parts by a plane perpendicular to the principal axis. It the power of the original lens is 4D, the power of a cut lens will be

SRMJEEE Physics Mock Test - 9 - Question 26

A particle performing uniform circular motion has angular momentum L. If its angular frequency is doubled, and its K.E. halved, then the new angular momentum is

SRMJEEE Physics Mock Test - 9 - Question 27

In an experiment of simple pendulum, the errors in the measurement of length of the pendulum (L) and time period (T) are 3%v and 2% respectively. The maximum percentage error in the values of (L/T2) is

SRMJEEE Physics Mock Test - 9 - Question 28

A mercury drop of radius 1cm is sprayed into 106 drops of equal size. The energy expended in joules is (surface tension of mercury is 460 x 10 − 3 Nm − 1)

SRMJEEE Physics Mock Test - 9 - Question 29

A current i passes through a wire of length l, radius of cross-section r and density ρ. The rate of heat generation is

SRMJEEE Physics Mock Test - 9 - Question 30

For a perfect gas, if α and β are volume and pressure coefficients of expansion.

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