Test Preparation on Alternating Current-I-Physics Test Series For NEET 2020

1.

An electric bulb marked as 50W - 200 V is connected
across a 100 V supply. The present power of the bulb is-

137.5 W
225W
312.5 W
410W

2.

A small signal voltage V(t) V sinw t 0 = is applied across an
ideal capacitor C-

1Current I(t), lags voltage V(t) by 900
2Over a full cycle the capacitor C does not consume any energy from the voltage source
3Current I(t) is in phase with voltage V(t)
4Current I(t) leads voltage V(t) by 1800

3.

1A
2B
3C
4D

4.

Alternating current can not be measured by dc ammeter
because-

1ac cannot pass through dc ammeter
2Average value of complete cycle is zero
3ac is virtual
4ac changes its direction

In dc ammeter, a coil is free to rotate in the magnetic
field of a fixed magnet.
If an alternating current is passed through such a coil,
the torque will reverse it’s direction each time the
current changes direction and the average value of the
torque will be zero.

5.

1A
2B
3C
4D


Right Ans	Wrong Ans	Not Attempted

Test Preparation on Alternating Current-I-Physics Test Series For NEET 2020

An electric bulb marked as 50W - 200 V is connectedacross a 100 V supply. The present power of the bulb is-

A small signal voltage V(t) V sinw t 0 = is applied across anideal capacitor C-

Alternating current can not be measured by dc ammeterbecause-

Check your progress:

An electric bulb marked as 50W - 200 V is connected
across a 100 V supply. The present power of the bulb is-

A small signal voltage V(t) V sinw t 0 = is applied across an
ideal capacitor C-

Alternating current can not be measured by dc ammeter
because-