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Test: Physics- 4

45 Questions MCQ Test NEET Mock Test Series | Test: Physics- 4

Description

This mock test of Test: Physics- 4 for NEET helps you for every NEET entrance exam. This contains 45 Multiple Choice Questions for NEET Test: Physics- 4 (mcq) to study with solutions a complete question bank. The solved questions answers in this Test: Physics- 4 quiz give you a good mix of easy questions and tough questions. NEET students definitely take this Test: Physics- 4 exercise for a better result in the exam. You can find other Test: Physics- 4 extra questions, long questions & short questions for NEET on EduRev as well by searching above.

QUESTION: 1

Figure shows some of the electric field lines corresponding to an electric field. The figure suggests

that

A.
E_A=E_C>E_B
B.
E_A=E_B=E_C
C.
E_A>E_B>E_C
D.
E_A=E_C=E_B

Solution:

Electric field is stronger where electric field lines are closer as depicted in the figure the field lines are almost having same distance near point A and C thus they are equal and near point B they are far thus indicating weak field at B .

At A and C, electric lines are equally spaced and dense that's why EA = EC > EB

QUESTION: 2

When the separation between two charges is increased,the electric potential energy of the charges

A.
increases
B.
decreases
C.
remains the same
D.
may increase or decrease

Solution:

QUESTION: 3

An electric dipole is placed in a uniform electric field.The net electric force on the dipole

A.
is always zero
B.
depends on the orientation of the dipole
C.
can never be zero
D.
depends on the strength of the dipole

Solution:

QUESTION: 4

The electric field in a region is directed outward and is proportional to the distance r from the origin.Taking the electric potential at the origin to be zero,

A.
it is uniform in the region
B.
it is proportional to r
C.
it is proportional to r²
D.
it increases as one goes away from the origin

Solution:

QUESTION: 5

A charge Q is uniformly distributed over a large plastic plate. The electric field at a point P close to the centre of the plate is 10 V/m. If the plastic plate is replaced by a copper plate of the same geometrical dimensions and carrying the same charge Q, the electric field at the

point P will become

A.
10 V/m
B.
20 V/m
C.
5 V/m
D.
zero

Solution:

QUESTION: 6

Electric charge are distributed in a small volume. The flux of the electric field through a spherical surface of radius 10cm surrounding the total charge is 25V-m The flux over a concentric sphere of radius 25cm will be

A.
25V–m
B.
50V–m
C.
100V–m
D.
200V–m

Solution:

QUESTION: 7

100V–m 4. A charge q is placed at the centre of the open end of a cylindrical vessel in figure. The flux of the electric field through the surface of the vessel is

A.
zero
B.
q/∈₀
C.
q/2∈₀
D.
2q/∈₀

Solution:

QUESTION: 8

Mark the correct options

A.
Gauss’s law is valid only for symmetrical charge distributions
B.
Gauss’s law is valid only for charges placed in vaccum
C.
The electric field calculated by Gauss’s law is the field due to the charges inside the Gaussian surface
D.
The flux of the electric field through a closed surface due to all the charges is equal to the flux due to the charges enclosed by the surface

Solution:

QUESTION: 9

Figure shows a closed surface which intersects a conducting sphere. If a positively charged is placed at the point P, the flux of the electric field through the closed surface

A.
will remain zero
B.
will become positive
C.
will become negative
D.
will become undefined

Solution:

QUESTION: 10

Two capacitors each having capacitance C and breakdown voltage V are joined in series. The capacitance and the breakdown voltage of the combination will be

A.
2 C and 2 V
B.
C/2 and V/2
C.
2 C and V/2
D.
C/2 and 2 V

Solution:

QUESTION: 11

A dielectric slab is inserted between the plates of an isolated capacitor. The force between the plates will

A. increase
B. decrease
C. remain unchanged
D. becomes zero

Solution:

QUESTION: 12

Two metal spheres of capacitances C₁& C₂ carry some charges. They are put in contact and then separated. The final charges Q₁& Q₂ on them will satisfy

A.
( Q₁ / Q₂) < (C₁/C₂)
B.
( Q₁ / Q₂) = (C₁/C₂)
C.
( Q₁ / Q₂) > (C₁/C₂)
D.
( Q₁ / Q₂) < (C₂/C₁)

Solution:

QUESTION: 13

A dielectric slab is inserted between the plates of an isolated charged capacitor. Which of the following quantities will remain the same?

A.
the electric field in the capacitor
B.
the charge on the capacitor
C.
the potential difference between the plates
D.
the stored energy in the capacitor

Solution:

QUESTION: 14

A parallel-plate capacitor is connected to a battery. A metal sheet of negligible thickness is placed between the plates. The sheet remains parallel to the plates of the capacitor

A. The battery will supply more charge
B. The capacitance will increase
C.
The potential difference between the plates will increase
D.
Equal and opposite charges will appear on the two faces of the plate

Solution:

QUESTION: 15

A uniform wire of resistance 50 Ω is cut into 5 equal parts. These parts are now connected in parallel. The equivalent resistance of the combination is

A.
2 Ω
B.
10Ω
C.
250Ω
D.
6250Ω

Solution:

QUESTION: 16

The net resistance of an ammeter should be small to ensure that

A.
it does not get overheated
B.
is does not draw excessive current
C.
it can measure large currents
D.
it does not appreciably change the current to be measured

Solution:

QUESTION: 17

Consider a capacitor charging circuit. Let Q₁be the charge given to the capacitor in a time interval of 10 ms and Q₂ be the charge given in the next time interval of of 10 ms. Let 10 μC charge be deposited in a time interval t₁ and the next 10 μC charge is deposited in the next time interval t₂. Then,

A.
Q₁ > Q₂, t₁> t₂
B.
Q₁ > Q₂, t₁< t₂
C.
Q₁<Q₂, t₁> t₂
D.
Q₁< Q₂, t₁< t₂

Solution:

QUESTION: 18

Which one of the following quantities do not change when a resistor connected to a battery is heated due to the current ?

A. drift speed
B. resistivity
C. resistance
D. number of free electrons

Solution:

QUESTION: 19

The equivalent capacitance between the points A and B of five identical capacitors each of capacity C, will be

A. C/2
B. 5C
C. C/5
D. 2C

Solution:

QUESTION: 20

Four condensers each of capacity 4mF are connected as shown in the figure. If VP - VQ = 15 V the energy stored in the system is

A.
5.4 erg
B.
3.6 erg
C.
2.4 erg
D.
1.8 erg

Solution:

QUESTION: 21

If an electron is brought towards an another electron, the electric potential energy of the system

A. remains the same
B. becomes zero
C. increases
D. decreases

Solution:

QUESTION: 22

A hollow charged metal sphere has radius r. If the potential difference between its surface and a point at a distance 3r from the centre is V, then electric field intensity at a distance 3r is

A. V/2r
B. V/3r
C. V/6r
D. V/4r

Solution: FOR a sphere of charge Q and radius R∆V=(KQ/R) - ... more(KQ/3R)=2KQ/3R Electric field=KQ/(3R)² =KQ/9R² =V/6R.

QUESTION: 23

If the separation between the plates of a capacitor is 5 mm, then the area of the plate of a 3 F parallel plate capacitor is

A.
4.259 x 10⁹ m²
B.
1.964 x 10⁹ m²
C.
12.81 x 10⁹ m²
D.
1.694 x 10⁹ m²

Solution:

QUESTION: 24

An insulated charged sphere of radius 5 cm has a potential of 10 V at the surface. The potential at the centre will be

A.
same as that at 5cm from the surface
B.
same as that at 25 cm from the surface
C.
10 V
D.
zero

Solution:

QUESTION: 25

A particle of mass 2 g and charge 1

is held at a distance of 1m from a fixed charge 1mC. If the particle is released it will be repelled. The speed of particle when it is at a distance of 10 m from the fixed charge is

A. 90m/s
B. 100m/s
C. 45m/s
D. 55m/s

Solution:

QUESTION: 26

Two materials having the dielectric constants K₁ and K₂, are filled between two parallel plates of a capacitor, which is shown in the figure. The capacity of the capacitor is

Solution:

QUESTION: 27

Two point charges Q and –2Q are placed at some distance apart. If the electric field at the location of Q is E, the electric field at the location of –2Q will be

A.
3E/2
B.
-(E/2)
C.
E/2
D.
-2E

Solution:

QUESTION: 28

Shown in the figure is a distribution of charges. The flux of electric field due to these charges through the surface S is

A.
3q/ε₀
B.
2q/ε₀
C.
q/ε₀
D.
zero

Solution:

QUESTION: 29

Ten identical cells each of emf E and internal resistance r are connected in series to form a closed circuit. An ideal voltmeter connected across the three cells will read

A. 7E
B. 10E
C. 3E
D. zero

Solution:

QUESTION: 30

What is the equivalent resistance between A and B in the given figure ?

A.
100 Ω
B.
90 Ω
C.
40 Ω
D.
20 Ω

Solution:

QUESTION: 31

A battery of emf 20V and internal resistance 6 Ω is connected to a resister as shown in figure. If the current in the circuit is 1A, the resistance of the resistor will be

A.
14 Ω
B.
16 Ω
C.
28 Ω
D.
7 Ω

Solution:

QUESTION: 32

Given a current carrying wire of non-uniform cross-section. Which one of the following is constant through out the length of wire

A. Current only
B. Current and drift speed
C. Drift speed only
D. Current, electric field and drift speed

Solution:

QUESTION: 33

An electric bulb marked 40 W and 200 V, is used in a circuit of supply voltage 100 V. Its power is

A.
10W
B.
20W
C.
40W
D.
100W

Solution:

QUESTION: 34

A moving coil galvanometer is converted into an ammeter reading upto 0.03 A by connecting a shunt of resistance 4r across it and into ammeter upto 0.06 A, when a shunt of resistance r is used, what is the maximum current which can be sent through this galvanometer if no shunt is used

A.
0.04A
B.
0.03A
C.
0.02A
D.
0.01A

Solution:

QUESTION: 35

A galvanometer can withstand safely a maximum current of 5 mA. It is converted into voltmeter reading upto 20V by connecting in series an external resistance of 3.96 k Ω .The resistance of galvanometer is

A.
48 Ω
B.
44 Ω
C.
36 Ω
D.
40 Ω

Solution:

QUESTION: 36

Three resistors of 2 Ω , 3 Ω and 4 Ω are connected as shown in the given diagram, then the equivalent resistance will be

A.
12/13 Ω
B.
10/3 Ω
C.
13/12 Ω
D.
9 Ω

Solution:

QUESTION: 37

Direction : Read the following question and choose

A. If both Assertion and Reason are correct and reason is the correct explanation of assertion

B. If both Assertion and Reason are true, but Reason is not correct explanation of the Assertion

C. If Assertion is true, but the Reason is false

D. If Assertion is false, but the Reason is true

E. If both assertion and reason are false

Assertion : The capacity of conductor, under given circumstances remains constant irrespective of the charge present on it

Reason: Capacity depends on size and shape of conductor and also on the medium between the plates.

A.
A
B.
B
C.
C
D.
D

Solution:

QUESTION: 38

Direction : Read the following question and choose

A. If both Assertion and Reason are correct and reason is the correct explanation of assertion

B. If both Assertion and Reason are true, but Reason is not correct explanation of the Assertion

C. If Assertion is true, but the Reason is false

D. If Assertion is false, but the Reason is true

E. If both assertion and reason are false

Assertion: A small metal ball is suspended in a uniform electric field with an insulated thread. If high energy X-ray beam falls on the ball, the ball will be deflected in the electric field.

Reason : X-rays emit photoelectrons and metal becomes negatively charged

A.
A
B.
B
C.
C
D.
D

Solution:

QUESTION: 39

Direction: Read the following question and choose

A. If both Assertion and Reason are correct and the reason is the correct explanation of assertion

B. If both Assertion and Reason are true, but Reason is not a correct explanation of the Assertion

C. If Assertion is true, but the Reason is false

D. If Assertion is false, but the Reason is true

E. If both assertion and reason are false

Assertion: If a point charge be rotated in a circle around a charge, the work done will be zero.

Reason: Work done is equal be dot product of force and displacement.

A.
A
B.
B
C.
C
D.
D

Solution:

QUESTION: 40

Direction : Read the following question and choose

A. If both Assertion and Reason are correct and reason is the correct explanation of assertion

B. If both Assertion and Reason are true, but Reason is not correct explanation of the Assertion

C. If Assertion is true, but the Reason is false

D. If Assertion is false, but the Reason is true

E. If both assertion and reason are false
Assertion: At a point in space, the electric field points towards north, In the region, surrounding this point the rate or change of potential will be zero along the east and west

Reason: Electric field due to a charge is the space around the charge in which some another charge experienced a force

A.
A
B.
B
C.
C
D.
D

Solution:

QUESTION: 41

Direction : Read the following question and choose

A. If both Assertion and Reason are correct and reason is the correct explanation of assertion

B. If both Assertion and Reason are true, but Reason is not correct explanation of the Assertion

C. If Assertion is true, but the Reason is false

D. If Assertion is false, but the Reason is true

E. If both assertion and reason are false

Assertion: When a dielectric medium is filled between the plates of a condenser, its capacitance increases.

Reason : The dielectric medium reduces the potential difference between the plates of the condenser

A. A
B. B
C. C
D. D

Solution:

QUESTION: 42

Direction : Read the following question and choose

A. If both Assertion and Reason are correct and reason is the correct explanation of assertion

B. If both Assertion and Reason are true, but Reason is not correct explanation of the Assertion

C. If Assertion is true, but the Reason is false

D. If Assertion is false, but the Reason is true

E0. If both assertion and reason are false

Assertion : At any junction of a network, algebraic sum of various currents is zero

Reason : Current cannot be stored.

A.
A
B.
B
C.
C
D.
D

Solution:

QUESTION: 43

Direction : Read the following question and choose

A. If both Assertion and Reason are correct and reason is the correct explanation of assertion

B. If both Assertion and Reason are true, but Reason is not correct explanation of the Assertion

C. If Assertion is true, but the Reason is false

D. If Assertion is false, but the Reason is true

E. If both assertion and reason are false

Assertion : Voltmeter is much better than a potentiometer for measuring emf of cell

Reason: A potentiometer draws no current while measuring emf of a cell

A. A
B. B
C. C
D. D

Solution:

QUESTION: 44

Direction : Read the following question and choose

A. If both Assertion and Reason are correct and reason is the correct explanation of assertion

B. If both Assertion and Reason are true, but Reason is not correct explanation of the Assertion

C. If Assertion is true, but the Reason is false

D. If Assertion is false, but the Reason is true

E. If both assertion and reason are false

Assertion: If the length of the conductor is doubled, the drift velocity will become half of the original value (keeping potential difference unchanged)

Reason: At constant potential difference, drift velocity is inversely proportional to the lenght of the conductor

A. A
B. B
C. C
D. D

Solution:

QUESTION: 45

Direction : Read the following question and choose

A. If both Assertion and Reason are correct and reason is the correct explanation of assertion

B. If both Assertion and Reason are true, but Reason is not correct explanation of the Assertion

C. If Assertion is true, but the Reason is false

D. If Assertion is false, but the Reason is true

E. If both assertion and reason are false

Assertion: Kilo-watt-Hour is the unit of electric power

Reason: kWh is a commercial unit used for expressing consumed electric energy

A.
A
B.
B
C.
C
D.
D

Solution:

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Test: Physics- 4

45 Questions MCQ Test NEET Mock Test Series | Test: Physics- 4

Figure shows some of the electric field lines corresponding to an electric field. The figure suggests

that

When the separation between two charges is increased,the electric potential energy of the charges

An electric dipole is placed in a uniform electric field.The net electric force on the dipole

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Test: Physics- 4

45 Questions MCQ Test NEET Mock Test Series | Test: Physics- 4

Figure shows some of the electric field lines corresponding to an electric field. The figure suggests that

When the separation between two charges is increased,the electric potential energy of the charges

An electric dipole is placed in a uniform electric field.The net electric force on the dipole

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Figure shows some of the electric field lines corresponding to an electric field. The figure suggests

that