Physics · Chapter 9 of 11
Electricity: BPSC & UPPCS Prelims PYQs
20 previous-year questions on Electricity. Each one opens to its answer and explanation.
Which term in the following does not denote the electric power in electric circuit?
- AIR²
- BI²R
- CVI
- DV²/R
In short circuit, the value of electric current in a circuit:
- ADo not change
- BVery low
- CIncreases very high
- DContinuously changing
What is the device to protect equipments from the electric shock?
- AGenerator
- BFuse
- CMotor
- DCurrent controller
Assertion (A): Generally an alloy of lead and tin is used as a material of the fuse wire. Reason (R): Alloy of lead and tin has a higher melting point than copper and aluminium.
- ABoth (A) and (R) are true and (R) is the correct explanation of (A)
- B(A) is true, but (R) is false
- C(A) is false, but (R) is true
- DBoth (A) and (R) are true, but (R) is not the correct explanation of (A)
Which of the following is the resistance of the wire?
- AR = IV
- BR = I/2V
- CR = V/I
- DR = I/V
Reactance of a capacitor is
- ADirectly proportional to frequency
- BInversely proportional to sq. root of frequency
- CInversely proportional to frequency
- DNone of the above
An electron of mass M kg and charge e coulomb travels from rest through a potential difference of V volts. The final energy in joules would be
- AeV
- B(eV)/M
- Ce/V
- DMeV
Which of the following liquids is a bad conductor of electricity?
- ASalted water
- BOrange juice
- CLemon juice
- DNone of the above
Current density is
- Aa scalar quantity
- Ba vector quantity
- Cdimensionless
- DNone of the above
Which of the following photoelectric devices is most suitable for digital applications?
- APhotodiode
- BPhotovoltaic cell
- CPhotoemitter
- DMore than one of the above
- ENone of the above
Due to temperature variation along a conductor, potential variation occurs along it. This phenomenon is known as
- AJoule effect
- BSeebeck effect
- CPeltier effect
- DThomson effect
- ENone of the above/More than one of the above
Which of the following is not correctly matched?
- AVoltmeter - Potential difference
- BAmmeter - Electric current
- CPotentiometer - Electromotive force
- DGalvanometer - Electric resistance
- ENone of the above/More than one of the above
With reference to the electric potential, which of the following statements is/are correct?
- 1. It is a scalar quantity.
- 2. It is a vector quantity.
- AOnly 1
- BOnly 2
- CBoth 1 and 2
- DNeither 1 nor 2
The total resistance of a circuit having two parallel resistors is 1.403 kilo-ohm. If one of the resistors is 2.0 kilo-ohm then the other resistor will be
- A1.403 kilo-ohm
- B2.0 kilo-ohm
- C3.403 kilo-ohm
- D4.70 kilo-ohm
- ENone of the above / More than one of the above
On heating, the resistance of a semiconductor
- Aincreases
- Bdecreases
- Cremains same
- Dfirst increases and then decreases
- ENone of the above / More than one of the above
The device to measure electric current is -
- Avoltmeter
- Bammeter
- Cvoltameter
- Dpotentiometer
- ENone of the above / More than one of the above
The unit of electric power is
- Aampere
- Bvolt
- Ccoulomb
- Dwatt
- ENone of the above / More than one of the above
Which of the following elements is a semiconductor?
- AAluminium
- BSilicon
- CSilver
- DLead
Five bulbs each of 100 watt capacity in a tunnel are illuminated continuously for twenty hours. The consumption of electricity will be:
- AOne unit
- BTwo units
- CTen units
- DTwenty units
Which of the following is a semiconductor?
- APlastic
- BAluminium
- CWood
- DGermanium
All 11 chapters of Physics
- Units12 questions
- Motion11 questions
- Gravitation3 questions
- Energy4 questions
- Fluids7 questions
- Thermo17 questions
- Waves16 questions
- Optics26 questions
- Electricity20 questions
- Magnetism9 questions
- Modern Physics19 questions