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# JEE Main Physics Mock - 6

## 25 Questions MCQ Test Mock Test Series for JEE Main & Advanced 2021 | JEE Main Physics Mock - 6

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This mock test of JEE Main Physics Mock - 6 for JEE helps you for every JEE entrance exam. This contains 25 Multiple Choice Questions for JEE JEE Main Physics Mock - 6 (mcq) to study with solutions a complete question bank. The solved questions answers in this JEE Main Physics Mock - 6 quiz give you a good mix of easy questions and tough questions. JEE students definitely take this JEE Main Physics Mock - 6 exercise for a better result in the exam. You can find other JEE Main Physics Mock - 6 extra questions, long questions & short questions for JEE on EduRev as well by searching above.
QUESTION: 1

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QUESTION: 2

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QUESTION: 3

### A 5000 kg rocket is set for vertical firing. The exhaust speed is 800 m/s. To give an initial upward acceleration of 20 m/s2, amount of gas ejected per second to supply needed thrust will be (g=10 m/s2)

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QUESTION: 4

The energy of a photon of light with wavelength 5000Å is approximately 2.5eV. This way the energy of an X-ray photon with wavelength 1Å would be

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QUESTION: 5

Electric field at the centroid of a triangle carrying q charge at each corner is

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QUESTION: 6

A particle of mass m is executing uniform circular motion on a path of radius r. If p is the magnitude of its linear momentum. The radial force acting on the particle is

Multiplying and dividing by m
Force= m²v²/rm
Momentum p= MV
Force = p²/rm
QUESTION: 7
A block of mass M is pulled along a horizontal frictionless surface by a rope of mass m. If a force P is applied at the free end of the rope, then force exerted by the rope on the block is
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QUESTION: 8

A particle of mass m and charge q is placed at rest in a uniform electric field E and then released. The kinetic energy attained by the particle after moving a distance y is

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QUESTION: 9

Two NOT gates are connected at the two inputs of a NAND gate. This combination will behave like

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QUESTION: 10
In a capillary tube, water rises upto 3 mm. The height of water that will rise in another capillary tube having one-third radius of the first is
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QUESTION: 11

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

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QUESTION: 12
If a long hollow copper pipe carries a current, the produced magnetic field will be
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QUESTION: 13
In a fission of U235 nucleus on average ----- neutrons are released.
Solution: When U235 is bombarded by a neutron, it splits into barium,
Krypton and 2 or 3, so average 2.5 neutrons per fission
QUESTION: 14
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):Physical properties of all isotopes are the same.
Reason(R):Nuclei having same number of protons are all called isotopes.
Solution:
QUESTION: 15

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):Two bodies 1 and 2 exerting forces on each other.Force exerted on the body 1 by body 2 is F 12 and that exerted on the body 2 (by body 1) is F 21 . Then F 12 = − F 21 .
Reason(R):Force F 12 is of action and force F 21 is of reaction.

Solution:

Assertion is true as acc to Newton second law Fab=-Fba i.e every action has an equal and opposite reaction. Since force is a Vector quantity opposite direction is to be indicated by negative sign. So in question assertion is true but in reason the force of reaction is not in opposite direction because negative sign is not there. So reason is false.

QUESTION: 16

The M.I. of a body about the given axis is 1.2 kg x m2 initially the body is at rest. In order to produce a rotational kinetic energy of 1500 joule an angular acceleration of 25 rad/sec must be applied about that axis for a duration of

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QUESTION: 17
The internal energy of an ideal gas increases during an isothermal process when the gas is
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QUESTION: 18

Dimensional formula for torque is

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QUESTION: 19
For the wave y = 20 sin π (x/4 + t/2), the correct statement is (where x is in metre and time is in second)
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QUESTION: 20

The radionuclide 56Mn is being produced in a cyclotron at a constant rate P by bombarding a manganese target with deutrons. 56Mn has a half life of 2.5 hours and the target contains large number of only the stable manganese isotope 55Mn. The reaction that produces 56Mn is:

55Mn+d→56Mn+P

After being bombarded for a long time, the activity of 56Mn becomes constant equal to 13.86×10s−1. (Use ln2 = 0.693; Avogadro number = 6×1023 atomic weight of 56Mn = 56gm/mole)

Q. After a long time bombardment, number of 56Mn nuclei present in the target depends upon
(a) The number of 56Mn nuclei present at the start of the process
(b) Half life of the 56Mn
(c) The constant rate of production P

Solution:
*Answer can only contain numeric values
QUESTION: 21

A circular road of radius 1000 m has banking angle 45º. The maximum safe speed of a car having a mass 2000 kg will be, if the coefficient of friction between tyre and road is 0.5 :-

Solution:

*Answer can only contain numeric values
QUESTION: 22

A bob of mass m, suspended by a string of length ℓ1 is given a minimum velocity required to complete a full circle in the vertical plane. At the highest point, it collides elastically with another bob of mass m  suspended by a string of length ℓ2, which is initially at rest. Both the strings are mass-less and inextensible. If the second bob, after collision acquires the minimum speed required to complete a full circle in the vertical plane, the ratio ℓ1/ℓ2 is.

Solution:

*Answer can only contain numeric values
QUESTION: 23

A ring of radius 2m weights 100 kg. Its having pure rolling motion on a horizontal floor so that its centre of mass has a speed of 20 cm/s. If work done to stop it is xJ. Then x will be

Solution:

*Answer can only contain numeric values
QUESTION: 24

2 kg ice at – 20°C is mixed with 5 kg water at 20°C. Then final amount of water in the mixture would be :
Given specific heat of ice = 0.5cal/g°C, specific heat of water = 1 cal/g°C,  Latent heat of fusion of ice = 80 cal/g. (in kg)

Solution:

*Answer can only contain numeric values
QUESTION: 25

A diode having potential difference 0.5 V across its junction which does not depend on current, is connected in series with resistance of 20 Ω across source. If 0.1 A passes through resistance then what is the voltage of the source :-

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