Test: Electrical Appliances


10 Questions MCQ Test Physics Class 12 | Test: Electrical Appliances


Description
This mock test of Test: Electrical Appliances for Class 12 helps you for every Class 12 entrance exam. This contains 10 Multiple Choice Questions for Class 12 Test: Electrical Appliances (mcq) to study with solutions a complete question bank. The solved questions answers in this Test: Electrical Appliances quiz give you a good mix of easy questions and tough questions. Class 12 students definitely take this Test: Electrical Appliances exercise for a better result in the exam. You can find other Test: Electrical Appliances extra questions, long questions & short questions for Class 12 on EduRev as well by searching above.
QUESTION: 1

Sensitivity of potentiometer can be increased by

Solution:

Sensitivity of the potentiometer means the smallest potential difference it can measure. It can be increased by reducing the potential gradient. The same is possible by increasing the length of the potentiometer. Hence the correct option is option C.

QUESTION: 2

In a potentiometer a cell of e.m.f 2V gives a balance point at 30cm. If the cell is replaced by another cell and the balance point shifts to 60cm.What is the e.m.f of the other cell?​

Solution:

Changes(if required):
Solution:
We can use the formula E1/E2=L1/L2
E1=2v,E2=?,l1=30,l2=60
2/E2=30/60
E2=120/30=4v

QUESTION: 3

When the position of cell and galvanometer in a Wheatstone bridge is inter-changed, its balanced condition

Solution:

For balanced Wheatstone bridge which is shown in figure a, P/Q​=S/R​
If we interchange the cell and galvanometer then circuit becomes as shown in figure b.
and balanced condition, P/S​=Q​/R⇒P/Q​=S/R​
Thus, balanced point remains unchanged.

QUESTION: 4

An electric bulb is rated 220 V and 100 W. Power consumed by it operated on 110 V is

Solution:

Power, P= V2/R​
R= V2/P​
R=220×220/100 ​=484Ω
The current flow in the circuit,
i= V′/R​ (V′= supplied voltage)
i=110/484​=0.2272A
The voltage drop across the bulb is 110V
The power consumed by the bulb,
Pb​=V2/R​=110×110​/484
Pb​=25W
The correct option is C.
 

QUESTION: 5

Meter Bridge or Slide Wire Bridge is a practical form of

Solution:
QUESTION: 6

When Wheatstone bridge is in balance condition, the current through galvanometer will be

Solution:
QUESTION: 7

The resistance in ohms in the four arms of a Wheatstone bridge are as follows. In which combination of the following is the bridge balanced?​

Solution:

 Wheat stone bridge follows

 P/Q = R/S

So 2/3 = 4/6 

QUESTION: 8

Two bulbs A and B are rated 100 W, 120 V and 10 W, 120 V respectively. They are connected across a 120 V source in series. Calculate the current through each bulb.​

Solution:

Bulb A,
PA=100w
VA=120v
We know that, P=VI
So, I=P/V=100w/120v=5/6A=0.83A
Bulb B,
PB=100w
VB=120v
We know that, P=VI
So, I=P/V=10w/120v=1/12A=0.083A
Bulb A will consume more energy than bulb B when they are connected in parallel.
 

QUESTION: 9

Wheatstone bridge is used to measure

Solution:
QUESTION: 10

The Wheatstone bridge and its balance condition provides a practical method for the determination of

Solution:

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