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Physics: CUET Mock Test - 2 - CUET MCQ


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40 Questions MCQ Test CUET Mock Test Series - Physics: CUET Mock Test - 2

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Physics: CUET Mock Test - 2 - Question 1

Electric field is a _______

Detailed Solution for Physics: CUET Mock Test - 2 - Question 1

A scalar quantity is a quantity with magnitude only but no direction. But a vector quantity possesses both magnitude and direction. An electric field has a very specific direction (away from a positive charge or towards a negative charge). Hence electric field is a vector quantity. Moreover, we have to use a vector addition for adding two electric fields.

Physics: CUET Mock Test - 2 - Question 2

A wire placed along the north-south direction carries a current of 8 A from south to north. Find the magnetic field due to a 1 cm piece of wire at a point 200 cm north-east from the piece.

Detailed Solution for Physics: CUET Mock Test - 2 - Question 2

dB = 

dB = 1.4 × 10-9 T.

Physics: CUET Mock Test - 2 - Question 3

Three charges –q, Q and –q are placed in a straight line maintaining equal distance from each other. What should be the ratio q/Q so that the net electric potential of the system is zero?

Detailed Solution for Physics: CUET Mock Test - 2 - Question 3

Let the distance between any two charges is d. Therefore the net potential energy of the system is  But the total energy of the system is zero. So, -qQ - qQ + q2/2 = 0 hat means q = 4Q, i.e. q/Q = 4.

Physics: CUET Mock Test - 2 - Question 4

Two resistors are connected in parallel, whose resistance values are in the ratio 3:1. Find the ratio of power dissipated.

Detailed Solution for Physics: CUET Mock Test - 2 - Question 4

We can consider the relation that includes power and resistance, i.e. Power = voltage2/resistance . Since, the resistors are connected in parallel, the voltage across them will be the same. From this relation, power and resistance are inversely proportional to each other.
Thus,  
So, the power dissipated is in the ratio is 1:3.

Physics: CUET Mock Test - 2 - Question 5

Which among the following can be used to analyze circuits?

Detailed Solution for Physics: CUET Mock Test - 2 - Question 5

Kirchhoff’s Law is used to analyze circuits. This law is important because they represent connections of a circuit. Kirchhoff’s Law provide the constraints that let us find the current flowing and voltage across every circuit element.

Physics: CUET Mock Test - 2 - Question 6

Two point charges +4q and +q are kept at a distance of 30 cm from each other. At which point between them, the field intensity will be equal to zero?

Detailed Solution for Physics: CUET Mock Test - 2 - Question 6

The electric field at a distance of r from a charge q is equal to  Let the electric field intensity will be zero at a distance of x cm from +4q charge, so the fields due to the two charges will balance each other at that point. Therefore  Solving this we get x=20cm. Therefore the point will be 20cm away from the +4q charge.

Physics: CUET Mock Test - 2 - Question 7

If a non-polar substance is placed in an electric field, what will happen?

Detailed Solution for Physics: CUET Mock Test - 2 - Question 7

A non-polar substance consists of a huge number of dipoles in it, but they are oriented randomly and hence the net dipole moment of the substance becomes 0 and it acts as a non-polar substance. But if it is placed in an electric field, the dipoles present in it will orient themselves in the direction of the field and hence a net dipole moment will be observed, known as induced dipole moment. No current flow or oscillation of the substance will be observed.

Physics: CUET Mock Test - 2 - Question 8

What is the net electrostatic field in the interior of a conductor?

Detailed Solution for Physics: CUET Mock Test - 2 - Question 8

Net electrostatic field is zero in the interior of a conductor. When a conductor is placed in an electric field, its free electrons begin to move in the opposite direction. Negative charges are induced on the left end and positive charges on the right end of the conductor. The process continues until the electric field set up by induced charges becomes equal and opposite the external field.

Physics: CUET Mock Test - 2 - Question 9

A set up is such that there are three similar resistors, each of 20 ohms resistance. Two of them are connected in parallel, and this combination is connected in series with the third one. The maximum power that can be consumed by each resistor is 30 W. Then, what is the maximum power that can be consumed by the combination of all three resistors?

Detailed Solution for Physics: CUET Mock Test - 2 - Question 9

The equivalent overall resistance of the parallel combination is:

R1 is in series with R2; So, R3 = R1 + R2 = 10 + 20 = 30 ohms.
Now, we can employ the method of cross-multiplication:
For 20 ohms resistor → 30 W power consumed
For 30 ohms resistor combination → x
20x = 30 × 30
x = (30 × 30)/20
x = 45
Therefore, the power consumed by the parallel combination is 45 ohms.

Physics: CUET Mock Test - 2 - Question 10

Find the false statement.

Detailed Solution for Physics: CUET Mock Test - 2 - Question 10

Kirchhoff’s 2nd year is applied in a closed loop. Kirchhoff’s 2nd law supports the law of conservation of energy. This means that energy is neither created nor destroyed in the closed loop. Whatever energy enters the loop, same amount leaves the loop.

Physics: CUET Mock Test - 2 - Question 11

What is the dimension of electric field intensity?

Detailed Solution for Physics: CUET Mock Test - 2 - Question 11

Electric field intensity is defined as the force on a unit positive charge kept in an electric field. Hence we can simply consider its dimension as (the dimension of force/the dimension of charge). The dimension of force is [MLT-2] and the dimension of charge is [IT]. Therefore the dimension of field intensity is [M L T-3 I-1].

Physics: CUET Mock Test - 2 - Question 12

Give the SI unit of magnetic permeability of free space.

Detailed Solution for Physics: CUET Mock Test - 2 - Question 12

Magnetic permeability of free space is a measure of the amount of resistance encountered when forming a magnetic field in a classical vacuum. The SI unit of permeability is weber ampere-1 metre-1 (Wb A-1 m-1) or tesla ampere-1 meter (T A-1 m).

Physics: CUET Mock Test - 2 - Question 13

Identify the expression for ampere’s circuital law from the following?

Detailed Solution for Physics: CUET Mock Test - 2 - Question 13

Ampere’s circuital law states that the line integral of magnetic field around any closed path in vacuum is equal to μ0 times the total current passing the closed path. It is given by: ∮ B .dl = μ0I
Ampere’s circuital law is analogous to Gauss’s law in electrostatics.

Physics: CUET Mock Test - 2 - Question 14

What torque acts on a 50 turn coil of 200 cm2 area carrying a current of 20 A held with its axis at right angles to a uniform magnetic field of 0.2T?

Detailed Solution for Physics: CUET Mock Test - 2 - Question 14

Torque = NIBA sinθ.
Torque = 50 × 20 × 0.2 × 200 × 10-4 × sin (90)
Torque = 4Nm.

Physics: CUET Mock Test - 2 - Question 15

Pick out the SI unit of magnetic flux.

Detailed Solution for Physics: CUET Mock Test - 2 - Question 15

The magnetic flux through a surface is the surface integral of the normal component of the magnetic field flux density passing through that surface. The SI unit of magnetic flux is weber (Wb). One weber is the flux produced when a uniform magnetic field of one tesla acts normally over an area of 1 cm2.

Physics: CUET Mock Test - 2 - Question 16

V/m is the unit of ______

Detailed Solution for Physics: CUET Mock Test - 2 - Question 16

E=-(dV/dx) where E is the field intensity, V is potential and x is distance. Therefore unit of electric field intensity will be (unit of potential/unit of distance) = V/m. Electric flux has unit V * m, V is the unit of electric potential whereas charge has a unit of Coulomb or esu.

Physics: CUET Mock Test - 2 - Question 17

State the rule that is used to find the direction of field acting at a point near a current-carrying straight conductor.

Detailed Solution for Physics: CUET Mock Test - 2 - Question 17

Right-hand thumb rule can be used to find the direction of the magnetic field at a point near a current-carrying conductor. Right hand rule states that, if the thumb of the right hand is in the direction of the current flow then, the curl fingers show the direction of the magnetic field.

Physics: CUET Mock Test - 2 - Question 18

What is the magnetic field inside a pipe?

Detailed Solution for Physics: CUET Mock Test - 2 - Question 18

The magnetic field inside a pipe, i.e. inside a hollow cylindrical wire is zero. This is due to the symmetry of the situation (pipe). The pipe can be considered as a series of thin wires arranged in a circle.

Physics: CUET Mock Test - 2 - Question 19

What is the maximum torque on a rectangular coil of area 4 cm × 80 cm of 400 turns, when carrying a current of 103 A in a magnetic field of 0.2 T?

Detailed Solution for Physics: CUET Mock Test - 2 - Question 19

Torque (Max) = NIBA.
Τmax = 400 × 103 × 0.2 × 320 × 10-4
Tmax = 2560 Nm.

Physics: CUET Mock Test - 2 - Question 20

Identify the correct dimensions of magnetic flux.

Detailed Solution for Physics: CUET Mock Test - 2 - Question 20

Magnetic flux = Magnetic field × Area.
Flux = 
Flux = 
Flux = [M L2 A-1 T-2].

Physics: CUET Mock Test - 2 - Question 21

How is the electric field at the surface of a charged conductor related to the surface charge density?

Detailed Solution for Physics: CUET Mock Test - 2 - Question 21

The electric field at the surface of a charged conductor is proportional to the surface charge density. The electric field is zero inside the conductor and just outside, it is normal to the surface. The contribution to the total flux comes only from its outer cross-section.

Physics: CUET Mock Test - 2 - Question 22

Identify the factor on which the torque on a planar current loop does not depend.

Detailed Solution for Physics: CUET Mock Test - 2 - Question 22

Torque on a planar current loop depends upon current, the strength of the magnetic field, area of the loop and the orientation of the loop in the magnetic field. It is independent of the shape of the loop.

Physics: CUET Mock Test - 2 - Question 23

Find out the correct relation from the following.

Detailed Solution for Physics: CUET Mock Test - 2 - Question 23

1 Wb = 1 T × 1 m2
Wb = 104 G × 104 cm2.
1 Wb = 108 Maxwell.

Physics: CUET Mock Test - 2 - Question 24

Which of the following is not a point of similarity between Biot-Savart law and Coulomb’s law.

Detailed Solution for Physics: CUET Mock Test - 2 - Question 24

The principle of superposition applies to both fields. This is because the magnetic field is linearly related to its source, namely, the current element and the electrostatic field is related linearly to its source, the electric charge.

Physics: CUET Mock Test - 2 - Question 25

Which law can ampere’s circuital be derived from?

Detailed Solution for Physics: CUET Mock Test - 2 - Question 25

In classical electrodynamics, the magnetic field given by a current loop and the electric field caused by the corresponding dipoles in sheets are very similar, as far as we are far away from the loop, which enables us to deduce Ampere’s magnetic circuital law from the Biot-Savart law easily.

Physics: CUET Mock Test - 2 - Question 26

Give the SI unit of magnetic pole strength.

Detailed Solution for Physics: CUET Mock Test - 2 - Question 26

The SI unit of magnetic pole strength is ampere meter (Am).
The strength of a magnetic pole is said to be one-ampere meter if it repels an equal and similar pole with a force of 10-7 N when placed in vacuum at a distance of one meter from it.

Physics: CUET Mock Test - 2 - Question 27

When is the magnetic flux said to be positive?

Detailed Solution for Physics: CUET Mock Test - 2 - Question 27

A normal to a plane can be drawn from either side. If the normal drawn to a plane points out in the direction of the field, then θ = 0o and the flux are taken as positive. If the flux is positive and increasing the voltage will be negative.

Physics: CUET Mock Test - 2 - Question 28

What is the total work done on moving a test charge on an equipotential surface?

Detailed Solution for Physics: CUET Mock Test - 2 - Question 28

The potential difference between any two points on an equipotential surface is zero.
Work done=Test charge x potential difference(0)
=Zero .

Physics: CUET Mock Test - 2 - Question 29

A long straight wire of radius x carries a steady current I. The current is uniformly distributed across its cross section. Calculate the ratio of the magnetic field at x/4 and 8x.

Detailed Solution for Physics: CUET Mock Test - 2 - Question 29

The magnetic field due to a long straight wire of radius x carrying a current I at a point distant r from the axis of the wire is given by:
Bin
Bin
The magnetic field at a distance of r = x/4:
B1 = 
The magnetic field at a distance of r = 8x:

Physics: CUET Mock Test - 2 - Question 30

‘X’ is the phenomenon of making a region free from any electric field. Identify X.

Detailed Solution for Physics: CUET Mock Test - 2 - Question 30

The phenomenon of making a region free from any electric field is called electrostatic shielding. It is based on the fact that the electric field vanishes inside the cavity of a hollow conductor.

Physics: CUET Mock Test - 2 - Question 31

When is the effective capacitance of a capacitor increased?

Detailed Solution for Physics: CUET Mock Test - 2 - Question 31

The effective capacitance of a capacitor is increased when the capacitors are connected in parallel. When the capacitors are connected in parallel, the equivalent capacitance is given by:
Cp = C1 + C2 + C3 +…….
When the capacitors are connected in parallel, the potential difference across each capacitor is the same.

Physics: CUET Mock Test - 2 - Question 32

Give the SI unit of the magnetic field from Biot-Savart law.

Detailed Solution for Physics: CUET Mock Test - 2 - Question 32

The SI unit of the magnetic field is the tesla (T). One tesla is 107 times the magnetic field produced by a conducting wire of length one meter and carrying a current of one ampere at a distance of one meter from it and perpendicular to it.

Physics: CUET Mock Test - 2 - Question 33

Find the true statement.

Detailed Solution for Physics: CUET Mock Test - 2 - Question 33

The force between two parallel current carrying wires is independent of the radii of the wires.
From Ampere’s circuital law, the magnitude of the field due to the first conductor can be given by:

The force between the parallel plates is given by:

From this equation, we understand that the force between the parallel current carrying wires does not depend on the ‘radii’.

Physics: CUET Mock Test - 2 - Question 34

‘X’ is the product of the pole strength of either magnetic pole and the magnetic length of the magnetic dipole. Identify X.

Detailed Solution for Physics: CUET Mock Test - 2 - Question 34

The product of the pole strength of either magnetic pole and the magnetic length of the magnetic dipole is called its magnetic dipole moment. The SI unit of magnetic dipole moment is Am2.

Physics: CUET Mock Test - 2 - Question 35

Calculate the magnetic flux when the magnetic field is perpendicular to the surface area.

Detailed Solution for Physics: CUET Mock Test - 2 - Question 35

Magnetic flux = B ΔS cos 00
Magnetic flux = B ΔS.
It follows that magnetic flux linked with a surface is maximum when the direction of the magnetic field is perpendicular to the surface area.

Physics: CUET Mock Test - 2 - Question 36

Under which of these conditions, the torque acting on the current-carrying loop is minimum?

Detailed Solution for Physics: CUET Mock Test - 2 - Question 36

When θ = 90o → τ = NIBA.
The torque is maximum when the plane of the loop is parallel to the magnetic field. So the angle θ has to be 90o.

Physics: CUET Mock Test - 2 - Question 37

Which type of physical quantity is magnetic flux?

Detailed Solution for Physics: CUET Mock Test - 2 - Question 37

The magnetic flux is measured as the product of the component of the magnetic field normal to the surface and the surface area.
Magnetic flux is a scalar quantity.

Physics: CUET Mock Test - 2 - Question 38

Calculate the torque on a 500 turn rectangular coil of length 20 cm and breadth 10 cm, carrying a current of 30 A, when placed making an angle of 60o with a magnetic field of 0.5 T?

Detailed Solution for Physics: CUET Mock Test - 2 - Question 38

Torque = NIBA cosθ [Angle between field and plane of coil].
Torque = 500 × 30 × 0.5 × 200 × 10-4 × cos (60)
Torque =75 Nm.
Therefore, the torque is 75 Nm.

Physics: CUET Mock Test - 2 - Question 39

Calculate the magnetic flux produced when the magnetic field is parallel to the surface area.

Detailed Solution for Physics: CUET Mock Test - 2 - Question 39

Magnetic flux = B ΔS cos 90o
Magnetic flux = 0.
It follows that magnetic flux linked with a surface is zero when the direction of the magnetic field is parallel to the surface area.

Physics: CUET Mock Test - 2 - Question 40

Give the SI unit of magnetic dipole moment.

Detailed Solution for Physics: CUET Mock Test - 2 - Question 40

Magnetic dipole moment = Current × Area.
SI unit of current = Ampere (A)
SI unit of area = meter2 (m2)
So, the SI unit of magnetic dipole moment = A × m2 = Am2

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