Q. No.A transformer is used to light a 100 W and 110 V lamp from a 220 V mains. If the main current is 0.5 A, the efficiency of the transformer is approximately :
1. 30%
2. 50%
3. 90%
4. 10%
To unlock all the explanations of 14 chapters you need to be enrolled in MasterClass Course.
To unlock all the explanations of 14 chapters you need to be enrolled in MasterClass Course.
A potentiometer is an accurate and versatile device to make electrical measurements of E.M.F. because the method involves:-
1. Potential gradients
2. A condition of no current flow through the galvanometer
3. A condition of cells, galvanometer, and resistances
4. Cells
To unlock all the explanations of 14 chapters you need to be enrolled in MasterClass Course.
To unlock all the explanations of 14 chapters you need to be enrolled in MasterClass Course.
The potential difference between the points A and B in the given figure is :
1. -3V
2. +3V
3. +6V
4. +9V
To unlock all the explanations of 14 chapters you need to be enrolled in MasterClass Course.
To unlock all the explanations of 14 chapters you need to be enrolled in MasterClass Course.
1. 1.2 times, 1.1 times
2. 1.21 times, same
3. both remain the same
4. 1.1 times, 1.1 times
To unlock all the explanations of 14 chapters you need to be enrolled in MasterClass Course.
To unlock all the explanations of 14 chapters you need to be enrolled in MasterClass Course.
2. current
3. drift velocity
4. electric field
To unlock all the explanations of 14 chapters you need to be enrolled in MasterClass Course.
To unlock all the explanations of 14 chapters you need to be enrolled in MasterClass Course.
2. 0.1 A
3. 2.0 A
4. 1.0 A
To unlock all the explanations of 14 chapters you need to be enrolled in MasterClass Course.
To unlock all the explanations of 14 chapters you need to be enrolled in MasterClass Course.
The power dissipated across the 8Ω resistor in the circuit shown here is 2 W. The power dissipated in watt units across the 3 Ω resistor is :
1. 2.0
2. 1.0
3. 0.5
4. 3.0
To unlock all the explanations of 14 chapters you need to be enrolled in MasterClass Course.
To unlock all the explanations of 14 chapters you need to be enrolled in MasterClass Course.
Consider the following two statements :
(A) Kirchhoff’s junction law follows from the conservation of charge.
(B) Kirchhoff’s loop law follows from the conservation of energy.
Which of the following is correct?
1. Both (A) and (B) are wrong
2. (A) is correct but (B) is wrong
3. (A) is wrong and (B) is correct
4. Both (A) and (B) are correct.
To unlock all the explanations of 14 chapters you need to be enrolled in MasterClass Course.
To unlock all the explanations of 14 chapters you need to be enrolled in MasterClass Course.
1. 8 V
2. 10 V
3. 2 V
4. 4 V
To unlock all the explanations of 14 chapters you need to be enrolled in MasterClass Course.
To unlock all the explanations of 14 chapters you need to be enrolled in MasterClass Course.
To unlock all the explanations of 14 chapters you need to be enrolled in MasterClass Course.
To unlock all the explanations of 14 chapters you need to be enrolled in MasterClass Course.
© 2025 GoodEd Technologies Pvt. Ltd.