| 4901 |
The resistivity of a metal wire depends on: |
Physics
Ohm’s law and resistance |
Easy |
| 4902 |
A metal wire has resistance 10 Ω at 0 °C and temperature coefficient 0.004 °C⁻¹. Its resistance at 100 °C is: |
Physics
Ohm’s law and resistance |
Medium |
| 4903 |
As the temperature of a pure semiconductor rises, its resistivity: |
Physics
Ohm’s law and resistance |
Hard |
| 4904 |
The resistance of the filament of a bulb rated 100 W, 220 V is: |
Physics
Electrical energy and power |
Easy |
| 4905 |
A 100 W, 220 V bulb is connected to a 110 V supply. Assuming constant resistance, it consumes: |
Physics
Electrical energy and power |
Medium |
| 4906 |
A 1000 W heater is used for 3 hours. The energy consumed is: |
Physics
Electrical energy and power |
Easy |
| 4907 |
One kilowatt-hour is equal to: |
Physics
Electrical energy and power |
Medium |
| 4908 |
Electric power is transmitted over long distances at very high voltage mainly because: |
Physics
Electrical energy and power |
Hard |
| 4909 |
A cell of emf 2 V and internal resistance 0.5 Ω is connected to a 3.5 Ω resistor. The terminal voltage is: |
Physics
Cells, emf and internal resistance |
Easy |
| 4910 |
Three identical cells, each of emf 1.5 V and internal resistance 0.5 Ω, are joined in series across a 3 Ω res… |
Physics
Cells, emf and internal resistance |
Medium |
| 4911 |
Two identical cells, each of emf 2 V and internal resistance 1 Ω, are joined in parallel across a 1.5 Ω resis… |
Physics
Cells, emf and internal resistance |
Medium |
| 4912 |
The terminal voltage of a cell equals its emf when: |
Physics
Cells, emf and internal resistance |
Easy |
| 4913 |
A cell of emf E and internal resistance r is being charged by a current I. Its terminal voltage is: |
Physics
Cells, emf and internal resistance |
Hard |
| 4914 |
Kirchhoff’s junction rule is a consequence of the conservation of: |
Physics
Kirchhoff’s rules and the Wheatstone bridge |
Easy |
| 4915 |
Kirchhoff’s loop rule is based on the conservation of: |
Physics
Kirchhoff’s rules and the Wheatstone bridge |
Easy |
| 4916 |
In a Wheatstone bridge, P = 10 Ω, Q = 20 Ω and R = 15 Ω. For balance, S must be: |
Physics
Kirchhoff’s rules and the Wheatstone bridge |
Medium |
| 4917 |
In a meter bridge, a 6 Ω resistor is in the right gap and the unknown resistance in the left gap. The null po… |
Physics
Kirchhoff’s rules and the Wheatstone bridge |
Medium |
| 4918 |
At balance, the condition of a Wheatstone bridge does NOT depend on: |
Physics
Kirchhoff’s rules and the Wheatstone bridge |
Hard |
| 4919 |
Oersted’s experiment first showed that: |
Physics
Biot-Savart law |
Easy |
| 4920 |
A circular loop of radius 0.1 m carries a current of 5 A. The magnetic field at its centre is about: |
Physics
Biot-Savart law |
Medium |