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COMEDK Mock Test - 10 - JEE MCQ


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30 Questions MCQ Test COMEDK Mock Test Series - COMEDK Mock Test - 10

COMEDK Mock Test - 10 for JEE 2024 is part of COMEDK Mock Test Series preparation. The COMEDK Mock Test - 10 questions and answers have been prepared according to the JEE exam syllabus.The COMEDK Mock Test - 10 MCQs are made for JEE 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for COMEDK Mock Test - 10 below.
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COMEDK Mock Test - 10 - Question 1

A nucleus of mass M emits γ-ray photon of frequency 'v'. The loss of internal energy by the nucleus is:

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COMEDK Mock Test - 10 - Question 2

The product of energy and time is called action. The dimensional formula for action is same as that for

Detailed Solution for COMEDK Mock Test - 10 - Question 2

Both are different from each other.
Energy × Time=(M1L2T−2)×(T1)=M1L2T−1
Force × Velocity=(M1L1T−2)×(L1T−1)=M1L2T−3
Impulse × distance=(M1L1T−1)×(L1)=M1L2T−1
Power=M1L2T−3
Angular Energy=M1L1T−2

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COMEDK Mock Test - 10 - Question 3

The soft-iron is a suitable material for making an electromagnet. This is because soft-iron has:

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Theoretically, an electromagnet requires high permeability and low retentivity.

COMEDK Mock Test - 10 - Question 4

Three capacitors, each of capacity 4 µF, are to be connected in such a way that the effective capacitance is 6 µF. This can be done by

Detailed Solution for COMEDK Mock Test - 10 - Question 4

To get equivalent capacitance 6 μF, out of the three, 4 μF capacitances, two are connected in series and the third one is connected in parallel.

COMEDK Mock Test - 10 - Question 5

Consider a mixture of n moles of helium gas and 2n moles of oxygen gas (molecules taken to be rigid) as an ideal gas. Its Cp/Cv value will be

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COMEDK Mock Test - 10 - Question 6

A current of 1.6 A is passed through CuSO4 solution. The number of Cu++ ions liberated per minute are:

Detailed Solution for COMEDK Mock Test - 10 - Question 6

Current I = 1.6 Amps, Time t = 1 minute or 60 seconds
Two electrons are needed to liberate one ion of Cu++, i.e. the charge required is = 2 × 1.6 × 10-19 C = 3.2 × 10-19C
The total charge flow in 1 minute is Q = It = 1.6A × 60s = 96C
Thus, the number of ions liberated is n

COMEDK Mock Test - 10 - Question 7

A ring of mass m, radius r having charge q uniformly distributed over it and free to rotate about it's own axis is placed in a region having a magnetic field B parallel to its axis. If the magnetic field is suddenly switched off, the angular velocity acquired by the ring is

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COMEDK Mock Test - 10 - Question 8

The following logic gate is equivalent to:

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Truth table for the given logic gate:

The truth table is similar to that of a NOR gate.

COMEDK Mock Test - 10 - Question 9

A bob is hanging over a pulley inside a car through a string. The second end of the string is in the hand of a person standing in the car. The car is moving with constant acceleration aa directed horizontally as shown in the figure. Another end of the string is pulled with constant acceleration a vertically. The tension in the string is equal to :

Detailed Solution for COMEDK Mock Test - 10 - Question 9

(Force diagram in the frame of the car)

Applying Newton's law perpendicular to the string

mg sinθ = ma cosθ

tanθ = a/g

Applying Newton's law along the string

COMEDK Mock Test - 10 - Question 10

A bullet of mass 5 g, travelling with a speed of 210 m/s, strikes a fixed wooden target. One half of its kinetic energy is converted into heat in the bullet, while the other half is converted into heat in the wood. The rise of temperature of the bullet if the specific heat of its material is 0.030 cal/(g-°C) (1 cal = 4.2 x 107 ergs) is close to

Detailed Solution for COMEDK Mock Test - 10 - Question 10

Given data:
Mass of the bullet, m = 5 g
Velocity of the bullet v = 210 m/s
Specific heat of bullet material, s = 0.030 cal/(g-°C) = 30 cal/(kg-°C)
Considering the given data,

COMEDK Mock Test - 10 - Question 11

Which of the following is hypnotic ?

COMEDK Mock Test - 10 - Question 12

Which one of the following is not the correct reaction of aryl diazonium salts?

COMEDK Mock Test - 10 - Question 13

A certain current liberate 0.5 g of hydrogen in 2 h. How many grams of copper can be liberated by the same current flowing for the same time in a copper sulphate solution?

COMEDK Mock Test - 10 - Question 14

If the standard electrode potential of Cu2+/Cu electrode is 0.34 V, what is the electrode potential at 0.01 M concentration of Cu2+? (T = 298K)

COMEDK Mock Test - 10 - Question 15

When acetaldehyde is treated with Fehling's solution, the following precipitate is formed

COMEDK Mock Test - 10 - Question 16

The number of atoms contained in 11.2 L of SO₂ at S.T.P. are

COMEDK Mock Test - 10 - Question 17

From the following values of dissociation constants of four acids which value represents the strongest acid ?

COMEDK Mock Test - 10 - Question 18

A reaction reaches a state of chemical equilibrium only when

COMEDK Mock Test - 10 - Question 19

What is the amount of heat liberated (in k.cal) when one mole of aquesous NaOH reacted with one mole of aqueous HCl solution?

COMEDK Mock Test - 10 - Question 20

Synthetic detergents are sodium salts of long chain

COMEDK Mock Test - 10 - Question 21

A chiral compound is

COMEDK Mock Test - 10 - Question 22

Box A contains 2 black and 3 red balls, while box B contains 3 black and 4 red balls. Out of these two boxes one is selected at random, and the probability of choosing box A is double that of box B. If a red ball is drawn from the selected box then the probability that it has come from box B is

COMEDK Mock Test - 10 - Question 23

The area bounded by the curve y=xsinx and x-axis between x=0 and x=2π is

COMEDK Mock Test - 10 - Question 24

If x dy = y(dx + y dy), y > 0 and y (1) = 1, then y (-3) is equal to

COMEDK Mock Test - 10 - Question 25

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COMEDK Mock Test - 10 - Question 26

∼ [ p ↔ q ] is

COMEDK Mock Test - 10 - Question 27

Which of the following statement is false?

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The determinant of skew-symmetric matrix of odd order is always zero
Therefore the inverse of skew-symmetric matrix does not exist

COMEDK Mock Test - 10 - Question 28

A card is drawn at random from a well shuffled pack of 52 cards. The probability of getting a heart or diamond is

COMEDK Mock Test - 10 - Question 29

The number of terms of the A.P. 3, 7, 11, 15,...to be taken so that the sum is 406 is

COMEDK Mock Test - 10 - Question 30

The line (x - 2)/3 = (y - 3)/4 = (z - 4)/5 is parallel to the plane

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