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SRMJEE Mock Test (Engg) - 12 - JEE MCQ


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30 Questions MCQ Test SRMJEEE Subject Wise & Full Length Mock Tests 2024 - SRMJEE Mock Test (Engg) - 12

SRMJEE Mock Test (Engg) - 12 for JEE 2024 is part of SRMJEEE Subject Wise & Full Length Mock Tests 2024 preparation. The SRMJEE Mock Test (Engg) - 12 questions and answers have been prepared according to the JEE exam syllabus.The SRMJEE Mock Test (Engg) - 12 MCQs are made for JEE 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for SRMJEE Mock Test (Engg) - 12 below.
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SRMJEE Mock Test (Engg) - 12 - Question 1

In a purely resistive A.C. circuit, the current

SRMJEE Mock Test (Engg) - 12 - Question 2

Alpha rays emitted from a radioactive substance are

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SRMJEE Mock Test (Engg) - 12 - Question 3

When a particle is in uniform circular motion it does not have—
(1) Radial velocity
(2) Radial acceleration
(3) Transverse velocity
(4) Transverse acceleration
The correct codes are-

SRMJEE Mock Test (Engg) - 12 - Question 4

If the memory chip size is 256 x 1 bits, what is the number of chips required to make up 1 Kbyte of memory?

SRMJEE Mock Test (Engg) - 12 - Question 5

A railway truck of mass 2x10 4 Kg travelling at 0.5 ms-1collides with another half of its mass moving in opposite direction with a velocity of 0.4ms-1. If the trucks couple automatically on collision, their common velocity after collision is

SRMJEE Mock Test (Engg) - 12 - Question 6

A 6 V battery is connected to the terminals of a 3 m long wire of uniform thickness and of resistance 100 Ω. The potential difference between two points on the wire, separated by a distance of 50 cm will be

SRMJEE Mock Test (Engg) - 12 - Question 7

Which of the following electromagnetic waves has minimum frequency ?

SRMJEE Mock Test (Engg) - 12 - Question 8

A wire whose cross-sectional area is 2mm2 is stretched by 0.1mm by a certain load. If a similar wire of triple the area of cross-section is stretched by the same load, the elongation of the second wire would be

SRMJEE Mock Test (Engg) - 12 - Question 9

If the no. of turns of a solenoid are doubled and its length is halved keeping the area of cross-section same, then ratio of initial and final self-inductances will be

SRMJEE Mock Test (Engg) - 12 - Question 10

A capacitor of 10 μF charged up to 250 volts is connected in parallel with another capacitor of 5 μF charged up to 100 volts. The common potential is

SRMJEE Mock Test (Engg) - 12 - Question 11

The horizontal acceleration that should be given to a smooth inclined plane of angle to keep an object stationary on the plane, relative to the inclined plane is

SRMJEE Mock Test (Engg) - 12 - Question 12

A body of mass m is taken to the bottom of a deep mine. Then

SRMJEE Mock Test (Engg) - 12 - Question 13

Consider a compound slab consisting of two different materials having equal thickness and thermal conductivities K and 2K respectively. The equivalent thermal conductivity of the slab is

Detailed Solution for SRMJEE Mock Test (Engg) - 12 - Question 13
Let length = L

Area = A

T1 be the temperature of the sink

T2 be the temperature of the source

T be the temperature of the junction

For the first conductor, the thermal rate is given by

H1/t =  KA (T – T1)/L  ---1

For the first conductor, the thermal rate is given by

H2/t =  2KA (T2 – T)/L  ---2

The two slabs are connected in series so the heat current flowing through will be same,

So,

SRMJEE Mock Test (Engg) - 12 - Question 14

A current passing through a circular coil of two turns produces a magnetic field B at its centre. The coil is then rewound so as to have four turns and the same current is passed through it. The magnetic field at its centre now is

SRMJEE Mock Test (Engg) - 12 - Question 15

One litre of helim gas at a pressure 76 cm of Hg and temperature 27°C is heated till its pressure and volume are doubled. The final temperature attained by the gas is

SRMJEE Mock Test (Engg) - 12 - Question 16

Earth's magnetic field always has a horizontal component except at

SRMJEE Mock Test (Engg) - 12 - Question 17

When two surfaces are coated with a lubricant, then they

SRMJEE Mock Test (Engg) - 12 - Question 18

Water is flowing over a fixed horizontal surface. If the velocity gradient at a distance 10 cm above the surface is 2 s⁻1, then velocity of layer will be

SRMJEE Mock Test (Engg) - 12 - Question 19

A ball is dropped from top of a tower of 100m height. Simultaneously another ball was thrown upward from bottom of the tower with a speed of 50 m/s (g=10 m/s2). They will cross each other after

Detailed Solution for SRMJEE Mock Test (Engg) - 12 - Question 19
The time taken by both balls at point P has same time ' t ' seconds .

⇒ for first ball , that is in the diagram from A to P 

S = ut + 1/2 at^2

we know that u = 0 and  a = g 

⇒ ( 100 - x ) = (0)t + 1/2 gt^2------------(1)

now, for the second ball from B to P in the diagram , 

S = t + 1/2 at^2

where u = 50 m/s and a = -g 

therefore, x = 50(t) - 1/2gt^2 ------------------(2)

by adding equation (1) and (2) we will get ,

100 = 50 t 

implies, t = 100 / 50 

therefore t = 2 sec .

therefore the time that they cross each other is 2 seconds.

The image that i had attached will show the pictorial representation of the experiment .

SRMJEE Mock Test (Engg) - 12 - Question 20

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

Detailed Solution for SRMJEE Mock Test (Engg) - 12 - Question 20
Here Vr is the velocity of the river W.R.T ground , Vm is the velocity of man W.R.T ground , Vm is the velocity of man W.R.T river, V is the velocity of man W.R.T ground
tan 90=Vm sin120/ Vr+Vm cos120

Vr= -Vm cos120=  -(0.5)(-0.5)= 0.25 m/s
SRMJEE Mock Test (Engg) - 12 - Question 21

The kinetic energy of a particle, executing simple harmonic motion is 16 J when it is in its mean position. If the amplitude of oscillations is 25 cm and the mass of the particles is 5.12 kg, the time period of its oscillation is

Detailed Solution for SRMJEE Mock Test (Engg) - 12 - Question 21

K.E of a particle
So, at mean position, x = 0, a = 0.25 m

⇒ in equation (1), y = mω2
We know m = 5.12 kg
From equation 1, we get:
ω2 = 100
ω = 10s-1
As, time period, T = 2π/ω where ω is angular frequency.

SRMJEE Mock Test (Engg) - 12 - Question 22

Small liquid drops assume spherical shape because

SRMJEE Mock Test (Engg) - 12 - Question 23

A parachutist of weight 'w' strikes the ground with his legs fixed and comes to rest with an upward acceleration of magnitude 3 g. Force exerted on him by ground during landing is

SRMJEE Mock Test (Engg) - 12 - Question 24

A ball is projected with kinetic energy E at an angle of 45° to the horizontal. At the highest point during its flight, its kinetic energy will be

SRMJEE Mock Test (Engg) - 12 - Question 25

A ray of monochromatic light is incident on one refracting face of a prism of angle 75°. It passes through the prism and is incident on the other face at the critical angle. If the refractive index of the material of the Prism is 2 , the angle of incidence on the first face of the prism is

SRMJEE Mock Test (Engg) - 12 - Question 26

The moment of inertia of a uniform circular disc of radius 'R' and mass 'M' about an axis passing from the edge of the disc and normal to the disc is

SRMJEE Mock Test (Engg) - 12 - Question 27

If the error in the measurement of radius of a sphere is 0.1%, then the error in the measurement of volume will be

SRMJEE Mock Test (Engg) - 12 - Question 28

Due to which property of water tiny particles of camphor dance on the surface of water

SRMJEE Mock Test (Engg) - 12 - Question 29

"Heat can not by itself flow from a body at lower temperature to a body at higher temperature" is a statement or consequence of

SRMJEE Mock Test (Engg) - 12 - Question 30

The Peltier effect is

Detailed Solution for SRMJEE Mock Test (Engg) - 12 - Question 30
The Peltier effect is a temperature difference created by applying a voltage between two electrodes connected to a sample of semiconductor material. This phenomenon can be useful when it is necessary to transfer heat from one medium to another on a small scale.
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