Ac vs dc - class-X
Description: ac vs dc | |
Number of Questions: 23 | |
Created by: Saurabh Mittal | |
Tags: effects of electric current physics electro-magnetism |
The advantage of ac over dc is that:
Transformer is used for
State whether the following statement is True or False.
Identify the two types of current exist in physics.
$AC$ and $DC$ can be distinguished using.
A transistor based radio receiver set (effective resistance of the order of 18 ohms) operates on a 9V dc battery. If this replaced by a dc power supply with rating 9V, 500A then:
An A.C. source is rated $220V,50Hz$. The average voltage is calculated in a time interval of $0.01s$, it-
Hotwire ammeters are used for measuring _____________ currents.
As the frequency of an alternating current increases, the impedance of the circuit
If $\vartheta $ is the phase difference and T is time period then time difference between current and voltage is ;
The resistance of a coil for dc is $R$ ohms. When connected to ac supply the total resistance offered by circuit to ac current.
Consider the following statements:
(a) The magnitude and direction of alternating current reverses periodically.
(b) Frequency of alternating current in india is 50 Hz.
(c) The frequency of direct current is zero.
Which of the above statements are correct?
Choose the correct option
A neon lamp is connected to a voltage a.c. source. The voltage is gradually increased from zero volt. It is observed that the neon flashes at 50 V. The a.c. source is now replaced by a variable dc source and the experiment is repeated. The neon bulb will flash at
Assertion: Ohm's law cannot be applied to a.c circuit.
Reason: Resistance offered by capacitor for a.c source depends upon the frequency of the source.
Direct current is observed in :
A low frequency AC current is passed through a galvanometer. What will be the behavior of the pointer needle?
What is not a characteristic of alternating current ?
which is the correct option?
AC is not suitable for electrolysis because
Which of the statements is false?
AC: Alternating current
DC: Direct Current
What is not a characteristic of alternating current?
Why is AC preferred over DC for transmission of electrical power