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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 2025 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 2025 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for COMEDK Mock Test - 10 below.
Solutions of COMEDK Mock Test - 10 questions in English are available as part of our COMEDK Mock Test Series for JEE & COMEDK Mock Test - 10 solutions in Hindi for COMEDK Mock Test Series course. Download more important topics, notes, lectures and mock test series for JEE Exam by signing up for free. Attempt COMEDK Mock Test - 10 | 180 questions in 180 minutes | Mock test for JEE preparation | Free important questions MCQ to study COMEDK Mock Test Series for JEE Exam | Download free PDF with solutions
COMEDK Mock Test - 10 - Question 1
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Three concentric spherical shells have radii a, b and c (a < b < c) and have surface charge densities σ, −σ and σ respectively. If VA, VB and VC denote the potentials of the three shells, then, for c = a+b, we have

Detailed Solution for COMEDK Mock Test - 10 - Question 1

VA = VC > VB

COMEDK Mock Test - 10 - Question 2
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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.

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COMEDK Mock Test - 10 - Question 3
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A ball is projected from the bottom of an inclined plane of inclination 30o, with a velocity of 30 m s−1, at an angle of 30o with the inclined plane. If g = 10 ms−2, then the range of the ball on given inclined plane is

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Range on incline plane,

COMEDK Mock Test - 10 - Question 4
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A capacitor of capacitance C1 is charged by connecting it to a battery. The battery is then removed and this capacitor is connected to a second uncharged capacitor of capacitance C2. If the charge gets distributed equally on the two capacitors, then the ratio of the total energy stored in the capacitors, after connection to the total energy stored in them before connection, is
Detailed Solution for COMEDK Mock Test - 10 - Question 4

If Q is the initial charge on capacitor C1, then the initial energy is given by Ui = Q2/2C1.

As the two capacitors are connected together and the charge is distributed equally, the charge on each capacitor is Q/2.

Since the potential difference (in a parallel connection) across the two capacitors is also the same, it follows that their capacitance are equal (since C = Q/V).

Thus, C1 = C2 = C (say)

Also, Q1 = Q2 = Q/2

Therefore, the final energy stored in the two capacitors is

COMEDK Mock Test - 10 - Question 5
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A copper block of mass 5.0 kg is heated to a temperature of 500°C and is placed on a large ice block. What is the maximum amount of ice that can melt?
[Specific heat of copper: 0.39 J g-1°C-1 and latent heat of fusion of water: 335 J g-1]
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COMEDK Mock Test - 10 - Question 6
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A block of mass 10 kg starts sliding on a surface with an initial velocity of 9.8 ms-1. The coefficient of friction between the surface and block is 0.5. The distance covered by the block before coming to rest is [use g = 9.8 ms-2]
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COMEDK Mock Test - 10 - Question 7
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The value of current in the 6Ω resistance is:
Detailed Solution for COMEDK Mock Test - 10 - Question 7


Applying KCL at point P,

⇒ 10V + 12V - 1080 + 3V - 420 = 0
⇒ V = 60
⇒ Current in 6 Ω = V - 0/6 = 10 A

COMEDK Mock Test - 10 - Question 8
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A long solenoid of radius R carries a time (t) - dependent current I(t) = I0t(1 - t). A ring of radius 2R is placed co-axially near its middle. During the time interval 0 ≤ t ≤ 1, the induced current (IR) and the induced EMF(VR) in the ring change as
Detailed Solution for COMEDK Mock Test - 10 - Question 8

B = μ0 nl0(t)(1 - t)
Using B0 = μ0 nl0
So, B = B0t(1 - t)
Considering solenoid as an ideal solenoid, extended up to infinity and ring as its centre.

ϕ = BAS = B0t(1 - t)AS 


Since induced emf is changing, so current will also be changing because i = e/R
Since direction of emf is changing, so direction of current is also changing.
It will be zero at t = 0.5 sec

COMEDK Mock Test - 10 - Question 9
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Mass per unit area of a circular disc of radius a depends on the distance r from its centre as σ (r) = A + Br. The moment of inertia of the disc about the axis, perpendicular to the plane and passing through its centre is:
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COMEDK Mock Test - 10 - Question 10
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Which is correct statement?
COMEDK Mock Test - 10 - Question 11
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Two moles of HI was heated in a sealed tube at 440 oC till the equilibrium was reached. HI was found to be 22% decomposed. The equilibrium constant for dissociation is
COMEDK Mock Test - 10 - Question 12
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In an endothermic reaction, the value of ∆H is
COMEDK Mock Test - 10 - Question 13
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The number of possible structural isomers of C₄H₁₀O is
COMEDK Mock Test - 10 - Question 14
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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
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Ethyl chloride is converted into diethyl ether by
COMEDK Mock Test - 10 - Question 16
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Which of the following fluorides does not exist ?
COMEDK Mock Test - 10 - Question 17
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Which amino acid is achrial?
COMEDK Mock Test - 10 - Question 18
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A reversible reaction is said to have attained equilibrium, when
COMEDK Mock Test - 10 - Question 19
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100cc of 0.1M HCl and 100cc of 0.1 M NaOH solutions are mixed in a calorimeter. If the heat liberated is 'Q' kcal, the heat of neutralization ( Δ H ) (in kcal) of HCl(aq) and NaOH(l) is
COMEDK Mock Test - 10 - Question 20
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In Fe(CO)5 , the Fe ---- C bond possesses
COMEDK Mock Test - 10 - Question 21
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Diazo coupling is useful to prepare
COMEDK Mock Test - 10 - Question 22
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In the presence of acid, the hydrolysis of methyl cyanide gives
COMEDK Mock Test - 10 - Question 23
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The points (5,-4,2),(4,-3,1),(7,-6,4),(8,-7,5) are vertices of a
COMEDK Mock Test - 10 - Question 24
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If the planes x+2y+Kz=0 and 2x+y-2z=0 are at right angles, then the value of K is
COMEDK Mock Test - 10 - Question 25
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Maximum slope of the curve y = -x3 + 3x2 + 9x − 27 is
COMEDK Mock Test - 10 - Question 26
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   for x ≠ 1 and if f is continuous at x = 1 then f(1) =
Detailed Solution for COMEDK Mock Test - 10 - Question 26

Explanation:


  • Given that f is continuous at x = 1, it means that the limit of f(x) as x approaches 1 exists and is equal to f(1).

  • Since x ≠ 1, the function is defined around x = 1.

  • Therefore, if f is continuous at x = 1, then f(1) must be equal to the value of the function at x = 1, which is A: 0, B: 1, C: e, or D: 1e.

  • Out of the given options, the value of the natural number e is the most likely value for f(1) when x ≠ 1 and f is continuous at x = 1.

  • Hence, the correct answer is C: e.

    •  
COMEDK Mock Test - 10 - Question 27
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The inverse of 

COMEDK Mock Test - 10 - Question 28
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Which of the following statement is false?
Detailed Solution for COMEDK Mock Test - 10 - Question 28

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 29
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Each coefficients in the equation ax2+bx+c=0 is determined by throwing an ordinary die. The probability that the equation will have equal roots is
COMEDK Mock Test - 10 - Question 30
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The standard deviation of 25 numbers is 40. If each of the numbers is increased by 5, then the new standard deviation will be
Detailed Solution for COMEDK Mock Test - 10 - Question 30

If each item of a data is increased (or decreased) by the same quantity, the standard deviation (and the variance) is not changed.

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