Physics: CUET Mock Test - 1 - CUET MCQ

# Physics: CUET Mock Test - 1 - CUET MCQ

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## 40 Questions MCQ Test CUET Mock Test Series - Physics: CUET Mock Test - 1

Physics: CUET Mock Test - 1 for CUET 2024 is part of CUET Mock Test Series preparation. The Physics: CUET Mock Test - 1 questions and answers have been prepared according to the CUET exam syllabus.The Physics: CUET Mock Test - 1 MCQs are made for CUET 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Physics: CUET Mock Test - 1 below.
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Physics: CUET Mock Test - 1 - Question 1

### The amount of force exerted on a unit positive charge in an electric field is known as _____

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

The zone near a charge where its attraction or repulsion force works, is known as the electric field of that charge. Theoretically, it is up to infinite but practically it has limitations. If a unit positive charge is kept in that field, it will undergo some force which is known as electric field intensity at that point.

Physics: CUET Mock Test - 1 - Question 2

### Which among the following molecule is not a dipole?

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

Though water and ammonia are covalent molecules, they have a net dipole moment due to their distorted structure than the ideal one. Hydrochloric acid has a linear molecular structure but its net dipole moment is towards the Hydrogen atom. But methane has a symmetrical tetrahedral structure and its net dipole moment is zero hence it doesn’t behave as a permanent dipole. Methane solvents are therefore non-polar solvents.

Physics: CUET Mock Test - 1 - Question 3

### Electric potential due to a point charge q at a distance r from the point is _______ (in the air).

Detailed Solution for Physics: CUET Mock Test - 1 - Question 3

Force on a unit point charge kept at a distance r from the charge = q/r2. Therefore, work done to bring that point charge through a small distance dr =(q/(r2)) * (-dr). Therefore, the potential of that point is =

Physics: CUET Mock Test - 1 - Question 4

In series connection of resistors, what happens to the current across each resistor?

Detailed Solution for Physics: CUET Mock Test - 1 - Question 4

When the resistors are connected in series, and current is passed through them, the current passing through each of the resistor is the same. This is because, the resistors are connected end to the end and, therefore, there is only one path for the current to flow through.

Physics: CUET Mock Test - 1 - Question 5

Which among the following is true?

Detailed Solution for Physics: CUET Mock Test - 1 - Question 5

According to Kirchhoff’s first law, the current flowing towards the junction is equal to the current leaving the junction. Mathematically, this law can be expressed as ∑nK – 1 IK = 0 (where n is the number of branches carrying current towards or away from the junction).

Physics: CUET Mock Test - 1 - Question 6

The direction of electric field created by a negative charge is _______

Detailed Solution for Physics: CUET Mock Test - 1 - Question 6

If a unit positive charge is kept near a negative charge, the unit positive charge will be attracted towards the negative charge. That means the electric field is towards the negative charge. But in case of positive charge, the field is directed away from the charge.

Physics: CUET Mock Test - 1 - Question 7

What is the dimension of the dipole moment?

Detailed Solution for Physics: CUET Mock Test - 1 - Question 7

The dipole moment is defined as the product of a charge and distance. The dimension of charge (current*time) is [I T] and the dimension of distance is [L]. Therefore the dimension of dipole moment is [L T I]. Its unit in the CGS and the SI system are esu*cm and C*m respectively.

Physics: CUET Mock Test - 1 - Question 8

Calculate electric potential due to a point charge of 10C at a distance of 8cm away from the charge.

Detailed Solution for Physics: CUET Mock Test - 1 - Question 8

In the SI system, electric potential due to a point charge at a distance r is Substituting the values, we get potential=  Though in practice, this huge value of electric potential is not present.

Physics: CUET Mock Test - 1 - Question 9

What is the equivalent resistance of series combination of 3 resistors?

Detailed Solution for Physics: CUET Mock Test - 1 - Question 9

When three resistors are connected in series, then the equivalent resistance of this combination is Rs = R1 + R2 + R3. So, if 3 resistors having resistances 10, 15, and 20 ohms, are connected in series, then equivalent resistance of this combination is Rs = 10 + 15 + 20 = 45 ohms.

Physics: CUET Mock Test - 1 - Question 10

The equation → ∑e = ∑IR is applicable to which law?

Detailed Solution for Physics: CUET Mock Test - 1 - Question 10

The equation → ∑e = ∑IR is applicable to Kirchhoff’s second law. This law is also known as Kirchhoff’s loop rule. This expression tells us that in a closed loop, the algebraic sum of the emfs is equal to the algebraic sum of the products of the resistance and currents flowing through them.

Physics: CUET Mock Test - 1 - Question 11

Electric field inside a hollow conducting sphere ______

Detailed Solution for Physics: CUET Mock Test - 1 - Question 11

According to Gauss’s law, if there is no charge inside a closed surface, the field inside the closed surface will always be zero. We know the charge is distributed on the outer surface of a conducting hollow sphere because the charges want to maintain maximum distance among them due to repulsion. So there is no charge inside the sphere and hence no electric field.

Physics: CUET Mock Test - 1 - Question 12

If the force acting on a point charge kept on the axis of an electric dipole is F, what will be the amount of force if the distance of the point charge is doubled from the dipole?

Detailed Solution for Physics: CUET Mock Test - 1 - Question 12

If the distance of a point charge, kept on the axis of a dipole, is sufficiently large than the separation between the charges of a dipole, then it can be shown that electric field E at a distance r from the dipole varies as E α 1/(r3). Now if the distance becomes 2r, electric field intensity will decrease by a factor of 2= 8 times. Therefore the force F will now become F/8.

Physics: CUET Mock Test - 1 - Question 13

What is the amount of work done to bring a charge of 4 * 10-3C charge from infinity to a point whose electric potential is 2 * 102V?

Detailed Solution for Physics: CUET Mock Test - 1 - Question 13

Work done = potential*charge by definition. We know that the potential of a point is the amount of work done to bring a unit charge from infinity to a certain point. Therefore, work done W = q * V = 4 * 10-3 * 200J = 0.8J. The work done is positive in this case.

Physics: CUET Mock Test - 1 - Question 14

Identify the combination which is not a series connection.

Detailed Solution for Physics: CUET Mock Test - 1 - Question 14

Domestic appliances in a house are connected in parallel combinations, and not in series combinations. This arrangement is done so that each of the appliances can switched on and off independently, which is essential in a house’s wiring.

Physics: CUET Mock Test - 1 - Question 15

Identify the correct statement from the following.

Detailed Solution for Physics: CUET Mock Test - 1 - Question 15

According to sign convention while traversing a closed loop (in clockwise or anti-clockwise direction), if positive pole of the cell is encountered first then its emf is negative or else, it will be positive.

Physics: CUET Mock Test - 1 - Question 16

Electric field due to a uniformly charged hollow sphere at a distance of r (where r is greater than the radius of the sphere) is __________

Detailed Solution for Physics: CUET Mock Test - 1 - Question 16

If the total charge of the sphere is q then the electric field at a distance of r is equal to  Therefore the electric field is proportional is (1/(r2)) (if r > radius of the sphere). But if r < radius of the sphere the electric field will be zero i.e. electric field inside a hollow sphere is always zero.

Physics: CUET Mock Test - 1 - Question 17

If electric field intensity at a certain distance from a dipole on its axis is E1 and at the same distance but on the perpendicular bisector of the dipole is E2, then __________

Detailed Solution for Physics: CUET Mock Test - 1 - Question 17

If the dipole moment of a dipole is p, then electric field intensity at a distance r from the dipole on its axis will be (2p/(r3)). But electric field intensity at a distance r from the dipole on its perpendicular bisector is (P/(r3)). Both the formulas are derived by assuming r >> length of the dipole. Thus E1= 2P/r3 and E2 = P/r3 and hence E1 = 2 E2.

Physics: CUET Mock Test - 1 - Question 18

Two point charges 10C and -10C are placed at a certain distance. What is the electric potential of their midpoint?

Detailed Solution for Physics: CUET Mock Test - 1 - Question 18

Electric potential is a scalar quantity and its value is solely dependent on the charge near it and the distance from that charge. In this case, the point is equidistant from the two point charges and the point charges have the same value but opposite nature. Therefore equal but opposite potentials are generated due to the charges and hence the net potential at midpoint becomes zero.

Physics: CUET Mock Test - 1 - Question 19

Three equal positive charges are kept at the corners of an equilateral triangle. What will be the vector sum of the forces acting on the particles?

Detailed Solution for Physics: CUET Mock Test - 1 - Question 19

The magnitude of the force acting on each of the charges will be the same and they will differ from each other by 120 degrees. Therefore their resultant force will always be zero.

Physics: CUET Mock Test - 1 - Question 20

Which among the following is false?

Detailed Solution for Physics: CUET Mock Test - 1 - Question 20

Coulomb force is a strong force. It can be shown that the Coulomb force between two electrons is 1043 times than gravitational force. All the other options are basic properties of Coulomb’s Law.

Physics: CUET Mock Test - 1 - Question 21

Two point charges q1 and q2 are situated at a distance d. There is no such point in between them where the electric field is zero. What can we deduce?

Detailed Solution for Physics: CUET Mock Test - 1 - Question 21

If both the charges are of the same polarity (maybe of unequal magnitude), there must be a point in between them where the electric field intensities of the charges are of equal magnitude and in opposite direction. Hence they balance each other and the net field intensity must be zero. But if the charges are of opposite polarities their field intensities aid each other and net field intensity can never be zero.

Physics: CUET Mock Test - 1 - Question 22

Dipole moment depends on _______

Detailed Solution for Physics: CUET Mock Test - 1 - Question 22

Dipole is defined as two equal but opposite charges, kept at a small distance and having a dipole moment. The dipole moment is simply the product of the electric charge and length of the dipole. The dielectric constant of the medium doesn’t affect the dipole moment i.e. dipole moment of an electric dipole will be the same in water as well as in the air.

Physics: CUET Mock Test - 1 - Question 23

Electric field intensity at the center of a square is _____ if +20 esu charges are placed at each corner of the square having side-length as 10 cm.

Detailed Solution for Physics: CUET Mock Test - 1 - Question 23

Distance of center from each corner point of the square is =  Therefore field intensity at the center due to a single charge is =  dyne/esu. But the fields due to the four charges are equal and are at perpendicular to each other. So the fields balance each other and the net electric field at the center will be equal to zero.

Physics: CUET Mock Test - 1 - Question 24

Pick out the correct statement from the following about parallel combination of resistors.

Detailed Solution for Physics: CUET Mock Test - 1 - Question 24

In parallel combination, the resistors are connected together at one end, and are also all connected together at the other end. So, the potential difference across the resistors will not change and thus, remains the same.

Physics: CUET Mock Test - 1 - Question 25

A ball of 80mg mass and a 2*10-8 charge is hung with a thread in a uniform horizontal electric field of 2*104V/m. What is the angle made by the thread with vertical?

Detailed Solution for Physics: CUET Mock Test - 1 - Question 25

According to the diagram, Tsin⁡θ = Eq; Tcos⁡θ = mg. Where T is the tension in the thread, m is the mass of the ball, E is the electric field and q is the charge of the ball. Dividing these two, we get tanθ = Eq/mg. Now substituting the value of E=2*104V/m, m=80mg, q=2*10-8C, g=9.8m/s2, we get tanθ = 25/49. Therefore θ=27 degree.

Physics: CUET Mock Test - 1 - Question 26

If an electric dipole is placed in a uniform electric field ______ will act on the dipole.

Detailed Solution for Physics: CUET Mock Test - 1 - Question 26

Dipole is the combination of two equal but opposite charges, kept at a certain distance. If it is placed in a uniform electric field, both the charges will suffer the same but opposite forces on them. As a result, the net force on the dipole becomes zero, but due to equal and opposite forces acting on two different points, there is a net torque acting on the dipole.

Physics: CUET Mock Test - 1 - Question 27

Find the electric field intensity at 10cm away from a point charge of 100 esu.

Detailed Solution for Physics: CUET Mock Test - 1 - Question 27

We know that electric field intensity at r distance from a point charge q is defined as q/r2 in the CGS system. Here q=100 esu, r=10cm. Substituting the value we get E=1dyne/esu. We must remember that factor 1/4πε  is considered only in the SI system and its value is 9*109, but in the CGS system, we simply take the value of this constant as unity.

Physics: CUET Mock Test - 1 - Question 28

A small charge q is rotated in a complete circular path of radius r surrounding another charge Q. The work done in this process is _________

Detailed Solution for Physics: CUET Mock Test - 1 - Question 28

We know that electric potential does not depend on the path, i.e. it is a state function. Therefore if we rotate a charge around another in a complete circular path, the potential energy of its initial and final points is the same. Therefore, there is no change of potential energy of the charge and hence net work done on the charge is zero.

Physics: CUET Mock Test - 1 - Question 29

Give the dimensional formula for magnetic permeability of free space.

Detailed Solution for Physics: CUET Mock Test - 1 - Question 29

Magnetic permeability = Magnetic flux density × [Magnetic field strength]-1.
μ = [M L0 T-2 A-1] × [M0 L-1 T0 A1]-1
μ = [M L T-2 A-2].

Physics: CUET Mock Test - 1 - Question 30

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

Detailed Solution for Physics: CUET Mock Test - 1 - Question 30

When θ = 0o → τ = 0.
The torque is minimum when the plane of the loop is perpendicular to the magnetic field, so the angle θ should be 0o.

Physics: CUET Mock Test - 1 - Question 31

Two point charges of the same polarities are hung with the help of two threads and kept close. The angle between the threads will be _________ if the system is taken to space.

Detailed Solution for Physics: CUET Mock Test - 1 - Question 31

There is gravitational field on earth, so if we hang the two same charges there will be an interaction of vertical gravitational field and horizontal electric field. The system will achieve equilibrium by creating a certain angle between the threads and hence the vertical and horizontal components of forces will balance. But in space, there is no gravity. So the charges will be at 180-degree separation.

Physics: CUET Mock Test - 1 - Question 32

Two point charges 1C and -1C are placed 5mm away from each other forming a dipole. What will be the field intensity at a point 15 cm away from the dipole on its axis?

Detailed Solution for Physics: CUET Mock Test - 1 - Question 32

Dipole moment
= 5*10-3cm.
We know, electric field at a point on the axis of a dipole:
[r = distance of the point from dipole]
P = 9*109, P = 5*10-3, r = 5*10-2 m.
∴   = 2.66*1016 N/C

Physics: CUET Mock Test - 1 - Question 33

Two plates are kept at a distance of 0.1m and their potential difference is 20V. An electron is kept at rest on the surface of the plate with lower potential. What will be the velocity of the electron when it strikes another plate?

Detailed Solution for Physics: CUET Mock Test - 1 - Question 33

Increase in potential energy of the electron when it strikes another plate = Potential difference*charge of electron = 20*1.6*10-19 J = 3.201*10-18J and as the electron was at rest initially, this energy will be converted to kinetic energy completely. Therefore, 0.5*mass of electron*(velocity)= 3.201*10-18J. Substituting m = 9.11*10-31kg, we get v = 2.65*106 m/s.

Physics: CUET Mock Test - 1 - Question 34

Two wires of the same material have the same length but their radii are in the ratio of 5:3. They are combined in series, where the resistance of the thicker wire is 12 ohms. Calculate the total resistance of the combination.

Detailed Solution for Physics: CUET Mock Test - 1 - Question 34

The given ratio of radii = 5:3;
R1 = 12 ohms (given); R2 = (5/3) × 12 = 20 ohms. So, R1 = 12 ohms and R2 = 20 ohms
Therefore, total resistance (R) = R1 + R2 (since they are combined in series) = 12 + 20
= 32 ohms
Thus, the total resistance of the combination is 32 ohms.

Physics: CUET Mock Test - 1 - Question 35

Which of the following is a unit of magnetic flux?

Detailed Solution for Physics: CUET Mock Test - 1 - Question 35

The CGS unit of magnetic flux is Maxwell (Mx). One Maxwell is the flux produced when a uniform magnetic field of one gauss acts normally over an area of 1 cm2.

Physics: CUET Mock Test - 1 - Question 36

An electron of mass m is kept in a vertical electric field of magnitude E. What must be the value of E so that the electron doesn’t fall due to gravity?

Detailed Solution for Physics: CUET Mock Test - 1 - Question 36

Gravitational force on the electron is m*g (weight of the electron). Electrical force on the body is e*E. If the electron doesn’t fall then these two forces balance each other, so m*g = E*e. Therefore E= (m*g)/e

Physics: CUET Mock Test - 1 - Question 37

An electric dipole is placed inside a cube. What will be the nature of electric flux from the cube surface?

Detailed Solution for Physics: CUET Mock Test - 1 - Question 37

An electric dipole consists of two point charges. The amount of charges is the same but their polarities are different. Therefore the sum of total charges in a dipole is always 0. But flux from a closed surface is related to the total charge inside a surface. As the total charge inside the cube is zero, so there will be no flux coming out or going in towards the surface.

Physics: CUET Mock Test - 1 - Question 38

Electric field intensity and electric potential at a certain distance from a point charge is 32 N/C and 16 J/C. What is the distance from the charge?

Detailed Solution for Physics: CUET Mock Test - 1 - Question 38

Electric field due to a charge q at a distance r is q/krand electric potential at that point is q/kr. Therefore,  q/kr2 = 32 and q/kr =16. Dividing these two equations, we get r=0.5m. If the medium is air, k = 1. Thus we can get the value of q = 0.89 C.

Physics: CUET Mock Test - 1 - Question 39

Three resistors each of 5 ohms are connected in the form of a triangle. What is the resistance between the vertices?

Detailed Solution for Physics: CUET Mock Test - 1 - Question 39

Equivalent resistance = 5 + 5 + (1/5) (since first two are in series, and they are in parallel to the third in case of a triangular arrangement)

Thus, R =
Therefore, the equivalent resistance is 10/3 ohms.

Physics: CUET Mock Test - 1 - Question 40

If an electric dipole is placed in a non-uniform electric field ______ will act on the dipole.

Detailed Solution for Physics: CUET Mock Test - 1 - Question 40

In the case of a non-uniform electric field, the force acting on both the charges of the dipole will be unequal. So, there will be a net force acting on the dipole in a certain direction. Also, there will be a torque due to two forces acting at two different points. But in case of a uniform electric field, the net force on the dipole will be zero but net torque will be non-zero.

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