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KEAM Paper 1 Mock Test - 4 - JEE MCQ


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30 Questions MCQ Test - KEAM Paper 1 Mock Test - 4

KEAM Paper 1 Mock Test - 4 for JEE 2024 is part of JEE preparation. The KEAM Paper 1 Mock Test - 4 questions and answers have been prepared according to the JEE exam syllabus.The KEAM Paper 1 Mock Test - 4 MCQs are made for JEE 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for KEAM Paper 1 Mock Test - 4 below.
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KEAM Paper 1 Mock Test - 4 - Question 1

The ratio of the largest to shortest wavelengths in Lyman series of hydrogen spectra is

KEAM Paper 1 Mock Test - 4 - Question 2

When the length and area of cross-section both are doubled, then its resistance

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KEAM Paper 1 Mock Test - 4 - Question 3

The more readily fissionable isotope of uranium has an atomic mass of

KEAM Paper 1 Mock Test - 4 - Question 4

A copper wire of resistance R is cut into ten parts of equal length. Two pieces each are joined in series and then five such combinations are joined in parallel. The new combination will have a resistance

KEAM Paper 1 Mock Test - 4 - Question 5

If an electron and a photon propagate in the form of waves having the same wavelength, it implies that they have the same

KEAM Paper 1 Mock Test - 4 - Question 6

Particle nature is shown by

KEAM Paper 1 Mock Test - 4 - Question 7

Which of the following electromagnetic waves have the smallest wavelength?

KEAM Paper 1 Mock Test - 4 - Question 8

A capacitor of capacitance 1μF is charged to 1KV. The energy stored in the capacitor in joules is

Detailed Solution for KEAM Paper 1 Mock Test - 4 - Question 8

C = 1μF
V = 1KV
energy stored U = 1/2 (CV2)
= 1/2 x 1 x 12 = 0.5

KEAM Paper 1 Mock Test - 4 - Question 9

A 4μF capacitor is charged to 400V. Then its plates are joined through a 100 Ω resistor. The heat produced in the resistor is

KEAM Paper 1 Mock Test - 4 - Question 10

The radius of orbit of a planet is two times that of the earth. The time period of planet is

KEAM Paper 1 Mock Test - 4 - Question 11

Gravitational mass is proportional to gravitational

KEAM Paper 1 Mock Test - 4 - Question 12

The energy emitted per second by a black body at 27ºC is 10J. If the temperature of the black body is increased to 327ºC, then energy emitted per second will be

KEAM Paper 1 Mock Test - 4 - Question 13

The energy supply being cut-off, an electric element cools down to the temperature of its surrounding. But it will not cool further, because

KEAM Paper 1 Mock Test - 4 - Question 14

Four blocks of same mass connected by cords are pulled by a force F on a smooth horizontal surface, as shown in figure. The tensions T1, T2 and T3 will be

KEAM Paper 1 Mock Test - 4 - Question 15

A particle starts from rest and has an acceleration of 2m − s⁻2 for 10 s. After that, it travels for 30 s with constant speed and then undergoes a retardation of 4 m − s⁻2 and comes back to rest. The total distance covered by the particle is

KEAM Paper 1 Mock Test - 4 - Question 16

Four charged particles are projected perpendicularly into the magnetic field with equal speed. Which will have minimum frequency?

KEAM Paper 1 Mock Test - 4 - Question 17

A bottle weighing 220 gram and of area of cross-section 50 cm2, and height 4 cm oscillates on the surface of water in vertical position. Its frequency of oscillation is

KEAM Paper 1 Mock Test - 4 - Question 18

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A):Doppler effect holds also for electromagnetic waves including microwaves, radio waves and visible light.
Reason(R) : As speed of light is independent of relative motion between source and observer, the formulae for doppler effect are different from that of sound.

KEAM Paper 1 Mock Test - 4 - Question 19

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): All processes in which pressure and volume are proportional, take place at constant temperature.
Reason(R): Work done in a thermodynamical process is path dependent.

KEAM Paper 1 Mock Test - 4 - Question 20

Scent sprayer is based on

KEAM Paper 1 Mock Test - 4 - Question 21

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): When we switch on the lights one after the other in our house the main current goes on increasing.
Reason(R): Voltage = current x resistance

KEAM Paper 1 Mock Test - 4 - Question 22

Atmospheric pressure is measured by

KEAM Paper 1 Mock Test - 4 - Question 23

If the period of oscillation of mass M suspended from a spring is one second, then the period of 4 M will be

KEAM Paper 1 Mock Test - 4 - Question 24

Two discs have same mass and thickness. Their materials have densities d₁ and d₂. The ratio of their moments of inertia about central axis will be

KEAM Paper 1 Mock Test - 4 - Question 25

A convex lens of focal length 0.15m is made of a material of refractive index 3/2. When it is placed in a liquid, its focal length is increased by 0.225m. The refractive index of the liquid is

Detailed Solution for KEAM Paper 1 Mock Test - 4 - Question 25
KEAM Paper 1 Mock Test - 4 - Question 26

The intensity ratio of the waves is 1 : 16. The ratio of their amplitudes is

KEAM Paper 1 Mock Test - 4 - Question 27

A copper block of mass 4 kg is heated in a furnance to a temperature 425ºC and then placed on a large ice block. The mass of ice that will melt in this process will be (Specific heat of copper=500 J-kg⁻1-ºC⁻1 and heat of fusion of ice = 336 kJ-kg⁻1).

KEAM Paper 1 Mock Test - 4 - Question 28

The ratio of the slopes of P-V diagrams of adibatic and isothermal processes is

Detailed Solution for KEAM Paper 1 Mock Test - 4 - Question 28

The slope of an adiabatic process is P-V graph DP/DV = y P/V (where P/V is the slope of an isothermal process). Therefore ratio of adiabatic slope to isothermal slope = y. 

KEAM Paper 1 Mock Test - 4 - Question 29

ML⁻1T⁻2 represents

KEAM Paper 1 Mock Test - 4 - Question 30

In young's double slit experiment, the intensity of central maximum is I. It one slit is closed, the intensity at the same place will become

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