# JEE(MAIN) Physics Mock Test - 6

## 30 Questions MCQ Test JEE Main Mock Test Series 2021 & Previous Year Papers | JEE(MAIN) Physics Mock Test - 6

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This mock test of JEE(MAIN) Physics Mock Test - 6 for JEE helps you for every JEE entrance exam. This contains 30 Multiple Choice Questions for JEE JEE(MAIN) Physics Mock Test - 6 (mcq) to study with solutions a complete question bank. The solved questions answers in this JEE(MAIN) Physics Mock Test - 6 quiz give you a good mix of easy questions and tough questions. JEE students definitely take this JEE(MAIN) Physics Mock Test - 6 exercise for a better result in the exam. You can find other JEE(MAIN) Physics Mock Test - 6 extra questions, long questions & short questions for JEE on EduRev as well by searching above.
QUESTION: 1

Solution:
QUESTION: 2

Solution:
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)

Solution:
QUESTION: 4

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

Solution:
QUESTION: 5

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

Solution:
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
Solution:
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

Solution:
QUESTION: 9

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

Solution:
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
Solution:
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

Solution:
QUESTION: 12
If a long hollow copper pipe carries a current, the produced magnetic field will be
Solution:
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

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

Dimensional formula for torque is

Solution:
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)
Solution:
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:
QUESTION: 21

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. At what constant rate P , 56Mn nuclei are being produced in the cyclotron during the bombardment?

Solution: QUESTION: 22

In Young's double slit experiment apparatus shown in figure wavelength of light used is λ. The screen is moved away from the source with a constant speed v. Initial distance between screen and plane of slits was D. Where s - source
d - distance between slits

Q. At a point P on the screen the order of fringe will:

Solution:
QUESTION: 23

In Young's double slit experiment apparatus shown in figure wavelength of light used is λ. The screen is moved away from the source with a constant speed v. Initial distance between screen and plane of slits was D. Where s - source
d - distance between slits

Q. Fringe width will

Solution:
QUESTION: 24

In Young's double slit experiment apparatus shown in figure wavelength of light used is λ. The screen is moved away from the source with a constant speed v. Initial distance between screen and plane of slits was D. Where s - source
d - distance between slits

Q. Suppose P is the point where 5th order maxima was lying at t = 0. Then after how much time third order minima will lie at this point ?

Solution:
QUESTION: 25

Which one of the following statements is WRONG in the context of X-rays generated from a X-ray tube ?

Solution:
QUESTION: 26

If there are n capacitors in parallel connected to V volt source, then energy stored is equal to

Solution:

Since the capacitors are connected in parallel to the battery, potential difference across each capacitor will be V. Hence, the total energy stored will be n times the energy stored in a single capacitor.
∴ U = n x 1/2 CV2  = 1/2 n CV2

QUESTION: 27

The mass C is connected by two wires to the vertical shaft AB, rotation of the shaft causes the mass to travel in the horizontal circle shown. The speed v0 of the mass that would result in equal tensions in the wires is Solution:
QUESTION: 28

The alloys constantan and manganin are used to make standard resistance due to they have

Solution:
QUESTION: 29

A charge +4q is located on the X-axis of a Cartesian coordinate system at x = -2a as shown. Another charge +(q/4) is located on the X-axis at x = a. Where on the Y-axis should a third charge -3q be placed so that the resultant electric field at the origin O has equal positive X and Y components? Solution:
QUESTION: 30

A straight wire of diameter 0.5 mm carrying a current of 1 A is replaced by another wire of 1 mm diameter carrying the same current. The magnetic field far away will be

Solution: 