1
###
Which one of the following devices is non-ohmic

Which one of the following devices is non-ohmic?

- Conducting copper coil
- Electric heating coil
- Semi conductor diode
- Rheostat

2
###
During Short circuiting, the current flowing in the electrical circuit

During Short circuiting, the current flowing in the electrical circuit

- increases instantaneously
- reduces substantially
- varies continuously
- does not change

3
###
The electric field inside a perfectly conducting hollow object is

The electric field inside a perfectly conducting hollow object is

- infinite
- 4π
- dependent upon the shape of the object
- zero

4
###
Van de graaff generator is used for

Van de graaff generator is used for

- generating large currents
- accelerating charged particles
- generating electric field
- generating high-frequency voltage

5
###
Two conducting wires A and B are made of same material

Two conducting wires A and B are made of same material. If the length of B is twice that of A and the radius of circular cross-section of A is twice that of B, then their resistances R_{A} and R_{B} are in the ratio

- 1 : 2
- 2 : 1
- 1 : 4
- 1 : 8

6
###
Which one of the following circuit elements is an active component

Which one of the following circuit elements is an active component?

- Transistor
- Capacitor
- Resistor
- Inductor

7
###
A fuse is used in the electric circuit to

A fuse is used in the electric circuit to

- break the circuit when power gets off
- complete the circuit for flow of current
- break the circuit when excessive current flows through the circuit
- indicate if the current is flowing uninterrupted

8
###
If two conducting spheres are separately charged

If two conducting spheres are separately charged and then brought in contact

- the total charge of the two spheres is conserved
- both the total energy and the total charge are conserved
- the final potential is always the mean of the original potential of the two spheres
- the total energy of the two spheres is conserved

9
###
When you pull out the plug connected to an electrical appliance

When you pull out the plug connected to an electrical appliance, you often observe a spark. To which property of the appliance is this related?

- Resistance
- Wattage
- Capacitance
- Inductance

10
###
Electricity is produced through dry cell from

Electricity is produced through dry cell from

- Nuclear Energy
- Mechanical Energy
- Chemical Energy
- Thermal Energy

11
###
Two resistors of resistance 2 Ω and 4 Ω when connected to a battery

Two resistors of resistance 2 Ω and 4 Ω when connected to a battery will have

- same current flowing through them when connected in parallel
- same current flowing through them when connected in series
- same potential difference across them when connected in series
- different potential difference across them when connected in parallel

12
###
An electric kettle consumes 1 kW of electric power when operated at 220 V

An electric kettle consumes 1 kW of electric power when operated at 220 V. A fuse wire of what rating must be used for it?

- 1 A
- 2 A
- 4 A
- 5 A

13
###
In an electrical circuit two resistors of 2 Ω and 4 Ω respectively

In an electrical circuit two resistors of 2 Ω and 4 Ω respectively are connected in series to a 6 V battery. The heat dissipated by the 4 Ω resistor in 5 s will be

- 5 J
- 10 J
- 20 J
- 30 J

14
###
In an electrical circuit three incandescent bulbs A, B and C of rating

In an electrical circuit three incandescent bulbs A, B and C of rating 40 W, 60 W and 100 W respectively are connected in parallel to an electric source. Which of the following is likely to happen regarding their brightness?

- Brightness of all the bulbs will be the same
- Brightness of bulb A will be the maximum
- Brightness of bulb B will be more than that of A
- Brightness of bulb C will be less than that of B

15
###
If the current I through a resistor is increased by 100%

If the current I through a resistor is increased by 100% (assume that temperature remains unchanged), the increase in power dissipated will be

- 100%
- 200%
- 300%
- 400%

16
###
A cylindrical conductor of length l and uniform area of cross-section

A cylindrical conductor of length l and uniform area of cross-section A has resistance R. Another conductor of length 2l and resistance R of the same material has area of cross section

- A/2
- 3A/2
- 2A
- 3A

17
###
What is the maximum resistance which can be made using five resistors

What is the maximum resistance which can be made using five resistors each of 1/5 Ω?

- 1/5 Ω
- 10 Ω
- 5 Ω
- 1 Ω

18
###
A current of 1 A is drawn by a filament of an electric bulb

A current of 1 A is drawn by a filament of an electric bulb. Number of electrons passing through a cross section of the filament in 16 seconds would be roughly

- 10
^{20} - 10
^{16} - 10
^{18} - 10
^{23}

19
###
Electrical resistivity of a given metallic wire depends upon

Electrical resistivity of a given metallic wire depends upon

- its length
- its thickness
- its shape
- nature of the material

20
###
In the following circuits, heat produced in the resistor or combination

In the following circuits, heat produced in the resistor or combination of resistors connected to a 12 V battery will be

- same in all the cases
- minimum in case (i)
- maximum in case (ii)
- maximum in case (iii)

21
###
In an electric bulb, light is produced due to the glowing of

In an electric bulb, light is produced due to the glowing of

- the glass case of the bulb.
- the thin filament.
- the thick wires supporting the filament.
- gases inside glass case of the bulb.

Consider the graph in which the birthrate and death rate of a country
Which frequency range is sensitive to human ears
log12 81 = p, then 3[(4-p)/(4+p)] is equal to
A right circular cone, of height 12 ft, stands on its base
Points E, F, G, H lie on the sides AB, BC, CD, and DA
While multiplying three real numbers, Ashok took one of the numbers
If x is a positive quantity such that 2x = 3^log5 2, then x is equal to
If u^2 + (u − 2v − 1)^2 = −4v(u + v), then what is the value of u + 3v