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1. Which one of the following is the unit of electric field?
-
- (a) Coulomb
- (b) Newton
- (c) Volt
- (d) N/C
| Answer:-Answer: (d) N/C |
2. Three charges + 3q + q and Q are placed on a st. line with equal separation. In order to maket the net force on q to be zero, the value of Q will be :
-
- (a) +3q
- (b) +2q
- (c) -3q
- (d) -4q
| Answer:- Answer: (a) +3q |
3. If an electric dipole is kept in a uniform electric field then resultant electric force on it is :
-
- (a) always zero
- (b) never zero
- (c) depend upon capacity of dipole
- (d) None
| Answer:- Answer: (a) always zero |
4. The number of electron-taken out from a body to produce 1 coulomb of charge will be :
-
- (a) 6.25 × 1018
- (b) 625 × 1018
- (c) 6.023 × 1023
- (d) None
| Answer:- Answer: (a) 6.25 × 1018 |
Matric Exam 2022 Math Online Test
5. The work done in rotating an electric dipole in an electric field:
-
- (a) W = ME (1 – cos θ)
- (b) W = ME tan θ
- (c)W = ME sec θ
- (d) None
| Answer:- Answer: (a) W = ME (1 – cos θ) |
6. If sphere of bad conductor is given charge then it is distributed on:
-
- (a) surface
- (b) inside the surface
- (c) only inside the surface
- (d) None
| Answer:- Answer: (d) None |
7. Electric field in a cavity of metal:
-
- (a) depends upon the surroundings
- (b) depends upon the size of cavity
- (c) is always zero
- (d) is not necessarily zero
| Answer:- Answer: (d) is not necessarily zero |
8. The dielectric constant of a metal is:
-
- (a) 0
- (b) 1
- (c) ∞
- (d) -1
| Answer:- Answer: (c) ∞ |
9. 1 coulomb is equal to:
-
- (a) 3 × 109 e.s.u.
- (b) 13 × 109 e.s.u.
- (c) 3 × 1010 e.s.u.
- (d) 13 × 1010 e.s.u.
| Answer:-Answer: (a) 3 × 109 e.s.u. |
10. Each of the two point charges are doubled and their distance is halved. Force of interaction becomes p times, w here p is :
-
- (a) 1
- (b) 4
- (c) 1/16
- (d) 16
| Answer:-Answer: (d) 16 |
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11. Coulomb’s law in vector form can be written as
F⃗= (1/4πεn) (q1q2/r2)r⃗
where ε0 is the permitivity of free space. The SI units of ε0 will be:
-
- (a) N-1m-2C-2
- (b) Nm-2C2
- (c) N-1m-2C9
- (d) Nm-2C2
| Answer:-Answer: (c) N-1m-2C9 |
12. The dimensional representation of cu will be :
-
- (a) [MLT4 A2]
- (b) [M-1L-3T4A2]
- (c)[ML-2T ]
- (d) None of these
| Answer:-Answer: (b) [M-1L-3T4A2] |
13. When placed in a uniform field, a dipole experiences:
-
- (a) a net force
- (b) a torque
- (c) both a net force and torque
- (d) neither a net force nor a torque
| Answer:-Answer: (b) a torque |
(a) experience a mild shock ‘14. A parrot comes and sits on a bare high power line. It will:
-
- (b) experience a strong shock.
- (c) get killed instantaneously
- (d) not be affected practically
| Answer:-Answer: (d) not be affected practically |
15. The SI units of electric dipole moment are:
-
- (a) C
- (b) Cm-1
- (c) Cm
- (d) Nm-1
| Answer:-Answer: (c) Cm |
16. If two conducting sphere are connected after charging separately then:
-
- (a) Electrostatic energy sphere energy will remain conserved
- (b) Electrostatic energy charges remains conserved
- (c) Electrostatic energy energy and charge remains conserved
- (d) None
| Answer:-Answer: (b) Electrostatic energy charges remains conserved |
17. A soap bubble is given a negative charge, then its radius:
-
- (a) increases
- (b) decreases
- (c) remains unchanged
- (d) may increase or decrease
| Answer:-Answer: (a) increases |
18. In non-uniform electric field, electric dipole experiences:
-
- (a) torque only
- (b) torque as well as net force
- (c) force only
- (d) None of these
| Answer:-Answer: (b) torque as well as net force |
19. An electron is sent in an electric field of magnitude 9.1 × 106NC-1. The acceleration produced in it is :
-
- (a) 1.6 ms-2
- (b) 1.6 × 1018ms-2
- (c) 3.2 × 1018ms-2
- (d) 0.8 × 1018 ms-2
| Answer:-Answer: (b) 1.6 × 1018ms-2 |
20. A semicircular arc of radius r is charged uniformly and the charge per unit length is λ. The electric field at the centre is:
-
- (a) λ/2λε0r2
- (b) λ/4πε0r
- (c) λ2/2πε0r
- (d) λ/2πε0r
| Answer:-Answer: (b) λ/4πε0r |
22. Two point charges +8q and -2q are located at ,v = O and ,v = L respectively. The location of a point on the .v-axis at which the net electric field due to these two point charges b is zero :
-
- (a) 4L
- (b) 8L
- (c) L/4
- (d) 2L
| Answer:-Answer: (d) 2L |
23. The graph drawn between V are r for a non-conducting charged solid sphere of radius R for r < R will be :
-
- (a) straight line
- (b) parabola
- (c) hyperbola
- (d) None of these
| Answer:-Answer: (d) None of these |
24. Corona discharge takes place:
-
- (a) at the surface of a conductor
- (b) near the sharp points of a conductor
- (c) outside the conductor
- (d) at the centre of the conductor
| Answer:-Answer: (b) near the sharp points of a conductor |
25. The belt of a Vande Graaf generator gets charge by :
-
- (a) corona discharge
- (b) induction
- (c) electrification
- (d) None of these
| Answer:-Answer: (a) corona discharge |
26. Quantisation of charge implies:
-
- (a) Charge does not exist
- (b) Charge exists on particles
- (c) There is a minimum permissible magnitude of charge
- (d) Charge can’t be created
| Answer:-Answer: (c) There is a minimum permissible magnitude of charge |
27. The conservation of electric charge implies that:
-
- (a) Charge can’t be created
- (b) Charge can’t be destroyed
- (c) The number of charged particle in the universe is constant
- (d) Simultaneous creation of equal and opposite charges is permissible
| Answer:-Answer: (d) Simultaneous creation of equal and opposite charges is permissible |
28. The number of electrons contained in one coulomb of charge is:
-
- (a) 6.25 × 1018
- (b) 6.25 × 1017
- (c) 6.25 × 1019
- (d) 1.6 × 1019
| Answer:-Answer: (a) 6.25 × 1018 |
29. The unit of intensity of electric field is :
-
- (a) metre/volt
- (b) Joule/newton
- (c) Coulomb/newton
- (d) Newton/coulomb
| Answer:-Answer: (a) metre/volt |
30. 1 V equals to:
-
- (a) 1 J
- (b) 1 JC-1
- (c) 1 CJ-1
- (d) 1 JC
| Answer:-Answer: (b) 1 JC-1 |
