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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

Description

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

An ac source is rated at 220V, 50Hz. The time taken for voltage to change from its peak value to zero is

A.
50 sec
B.
0.02 sec
C.
5 sec
D.
5 X 10^-3 sec

Solution:

QUESTION: 2

The ratio of secondary to primary turns is 9:4. If power input (neglect all losses) to power input

A.
4:9
B.
9:4
C.
5:4
D.
1:1

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)

A.
127.5 kg/s
B.
187.5 kg/s
C.
185.5 kg/s
D.
137.5 kg/s

Solution:

QUESTION: 4

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

A.
zero
B.
√2Kq/r²
C.
1/√2 = Kq/r²
D.
3Kq/r²

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

A.
2.5/5000 eV
B.
2.5/(5000)² eV
C.
2.5 x 5000 eV
D.
2.5 x (5000)² eV

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

A.
pmr
B.
rm/p
C.
mp²/r
D.
p²/rm

Solution: Radial force= mv²/r
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

A.
P
B.
Pm/M+m
C.
Pm/M-m
D.
PM/M+m

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

A.
q E y²
B.
q E²y
C.
q E y
D.
q²E y

Solution:

QUESTION: 9

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

A.
NAND gate
B.
AND gate
C.
OR gate
D.
NOR gate

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

A.
1 mm
B.
3 mm
C.
6 mm
D.
9 mm

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

A.
25^o8'
B.
33^o7'
C.
42^o8'
D.
53^o1'

Solution:

QUESTION: 12

If a long hollow copper pipe carries a current, the produced magnetic field will be

A.
inside the pipe only
B.
outside the pipe only
C.
both inside and outside the pipe
D.
neither inside nor outside the pipe

Solution:

QUESTION: 13

In a fission of U²³⁵ nucleus on average ----- neutrons are released.

A.
3
B.
2
C.
2.5
D.
5

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

A.
Both Assertion and Reason are true and Reason is the correct explanation of assertion.
B.
Both Assertion and Reason are true but Reason is not the correct explanation of assertion.
C.
Assertion is true but Reason is false.
D.
Both Assertion and Reason are false.

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.

A.
Both Assertion and Reason are true and Reason is the correct explanation of assertion.
B.
Both Assertion and Reason are true and Reason is not the correct explanation of assertion.
C.
Assertion is true but Reason is false.
D.
Assertion is false but Reason is true.

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/sec² must be applied about that axis for a duration of

A.
4 sec
B.
2 sec
C.
8 sec
D.
10 sec

Solution:

QUESTION: 17

The internal energy of an ideal gas increases during an isothermal process when the gas is

A.
Expanded by adding more molecules to it
B.
Expanded by adding more heat to it
C.
Expanded against zero pressure
D.
Compressed by doing work on it

Solution:

QUESTION: 18

Dimensional formula for torque is

A.
L²MT^-2
B.
L^-1MT^-2
C.
L²MT^-3
D.
LMT^-2

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)

A.
amplitude is 20 m and frequency is 0.25
B.
wavelength is 20 m and frequency is 1
C.
frequency is 1/2 and wavelength is 20 cm
D.
ω = 2π and K = π/2

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

A.
All (a), (b) and (c) are correct
B.
Only (a) and (b) are correct
C.
Only (b) and (c) are correct
D.
Only (a) and (c) are correct

Solution:

QUESTION: 21

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?

A.
2 ×10¹¹nuclei/sec
B.
6.93 ×10¹⁰nuclei/sec
C.
9.6 ×10¹⁰nuclei/sec
D.
13.86 ×10¹⁰nuclei/sec

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:

A.
Increase
B.
Decrease
C.
Remain constant
D.
First increase then decrease

Solution:

QUESTION: 23

Where s - source
d - distance between slits

Q. Fringe width will

A.
Increase
B.
Decrease
C.
Remains constant
D.
First increase then decrease

Solution:

QUESTION: 24

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 ?

A.
2D/v
B.
D/v
C.
3D/2v
D.
3D/v

Solution:

QUESTION: 25

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

A.
Wavelength of characteristic X-rays decreases when the atomic number of the target increases
B.
Cut-off wavelength of the continuous X-rays depends on the atomic number of the target
C.
Intensity of the characteristic X-rays depends on the electrical power given to the X-rays tube
D.
Cut-off wavelength of the continuous X-rays depends on the energy of the electrons in the X-ray tube

Solution:

QUESTION: 26

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

A.
CV
B.
CV²
C.
1/2n CV²
D.
none of the above

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

A.
8.55 m/s
B.
11.55 m/s
C.
19.6 m/s
D.
None of these

Solution:

QUESTION: 28

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

A.
Low resistivity
B.
High resistivity
C.
Low temperature coefficient of resistance
D.
Both (b) and (c)

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?

A.
y = 2a
B.
y = -3a
C.
y = -2a
D.
y = (3/4)a

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

A.
twice the earlier value
B.
same as the earlier value
C.
one-half of the earlier value
D.
one-quarter of the earlier value

Solution:

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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

An ac source is rated at 220V, 50Hz. The time taken for voltage to change from its peak value to zero is

The ratio of secondary to primary turns is 9:4. If power input (neglect all losses) to power input

4:9

9:4

5:4

1:1

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)

P

Pm/M+m

Pm/M-m

PM/M+m

1 mm

3 mm

6 mm

9 mm

inside the pipe only

outside the pipe only

both inside and outside the pipe

neither inside nor outside the pipe

3

2

2.5

5

Both Assertion and Reason are true and Reason is the correct explanation of assertion.

Both Assertion and Reason are true but Reason is not the correct explanation of assertion.

Assertion is true but Reason is false.

Both Assertion and Reason are false.

Expanded by adding more molecules to it

Expanded by adding more heat to it

Expanded against zero pressure

Compressed by doing work on it

amplitude is 20 m and frequency is 0.25

wavelength is 20 m and frequency is 1

frequency is 1/2 and wavelength is 20 cm

ω = 2π and K = π/2

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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)