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Sandra Saju
Subject: Physics
, asked on 6/2/18
Define ‘quality factor’ of resonance in series LCR circuit. What is its SI unit ?
Answer
1
Pranav Shorey
Subject: Physics
, asked on 5/2/18
No links please
Q). In the above figure there is variation of an alternating voltage with time. What is the average value of the voltage for the shaded part of the graph ?
Answer
1
Sandra Saju
Subject: Physics
, asked on 3/2/18
Please help with this question
Q.16. A multi range voltmeter can be constructed by using a galvanometer circuit as shown in the figure. We want to construct a voltmeter that can measure 2 V, 20 V and 200 V using a galvanometer of resistance 10
Ω
and that produces maximum deflection for current of 1 mA. Find the value of
R
1
,
R
2
a
n
d
R
3
that have to be used.
Answer
1
Ketul
Subject: Physics
, asked on 3/2/18
An series LCR circuit with voltage drop across L,C and R 10V each if the resistance is reduced to half then what is the voltage across each?
Answer
1
Aparna Sahu
Subject: Physics
, asked on 1/2/18
Please solve this .. no link this time
Q. The rate of cooling of a body is 0.5
°
C/minute, when the body is 50
°
C above the surrounding. What is the rate of cooling if the body is 30
°
C above the surrounding?
A. 24
°
C/hour
B. 18
°
C/hour
C. 30
°
C/hour
D. 12
°
C/hour
Answer
1
Aparna Sahu
Subject: Physics
, asked on 25/1/18
Solve this.
Q). A mixture of gas expands from 0.03
m
3
to 0.06
m
3
at a constant pressure of 1 MPa and absorbs 84 kJ of heat during the process. The change in internal energy of the mixture is
1. 84 kJ
2. 30 kJ
3. 114 kJ
4. 54 kJ
Answer
1
Komal Sharma
Subject: Physics
, asked on 24/1/18
70 and 72
Answer
1
Komal Sharma
Subject: Physics
, asked on 24/1/18
66
Q66. A coil when connected to a dc source of 12 V, carries a current of 4 A. If this coil is connected is a ac source of 12 V and 50 rad/s, then it carries a current of 2.4 A. The inductance of the coil is -
(A) 48 H (B) 4 H (3) 12.5 H (4) 8 ×10
–2
H
Answer
1
Komal Sharma
Subject: Physics
, asked on 24/1/18
59 and 61
Answer
1
Komal Sharma
Subject: Physics
, asked on 24/1/18
45 and 47
Q45. In a series LCR circuit, the inductive reactance is twice the resistance and the capacitive reactance is the inductive reactance. The power factor of the circuit is
(1) 0.5 (2) 0.6 (3) 0.8 (4) 1
Q47. A radio tuner has a frequency range from 500 KHz to 5 MHz. If its LC circuit has an effective inductance of 400
μ
H, the range of its variable capacitor is (Take
π
2
= 10)
(1) 250 pF to 2.5 pF (2) 500 pF to 5500 pF (3) 7.5 pF to 750 pF (4) 1000 pF to 10 pF
Answer
1
Komal Sharma
Subject: Physics
, asked on 24/1/18
Find the effective value of current
i
= 2 sin 100 π
t
+ 2 cos (100 π
t
+ 30°)
(1)
1
2
A
(2)
2
A
(3) 1 A (4)
2
2
A
Answer
1
Komal Sharma
Subject: Physics
, asked on 24/1/18
23 and 25
Q23. A condenser of capacity C is charged to a potential difference of V
1
. The plates of the condenser are then connected to an ideal inductor of inductance L. The current through the inductors when the potential difference access the condenser reduces to V
2
is ?
1
C
V
1
2
-
V
2
2
L
2
C
V
1
2
+
V
2
2
L
3
C
V
1
2
-
V
2
2
1
2
L
4
C
V
1
-
V
2
2
L
1
2
Q25. In an ac circuit an alternating voltage e = 200
2
sin 100 t volts is connected to a capacitor of capacity 1
μ
F. The r.m.s. value of the current in the circuit is :-
(1) 10 mA (2) 100 mA (3) 200 mA (4) 20 m A
Answer
1
Komal Sharma
Subject: Physics
, asked on 24/1/18
28
Answer
1
Komal Sharma
Subject: Physics
, asked on 24/1/18
21
Answer
1
Komal Sharma
Subject: Physics
, asked on 24/1/18
Q17
Answer
1
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What are you looking for?
Q). In the above figure there is variation of an alternating voltage with time. What is the average value of the voltage for the shaded part of the graph ?
Q.16. A multi range voltmeter can be constructed by using a galvanometer circuit as shown in the figure. We want to construct a voltmeter that can measure 2 V, 20 V and 200 V using a galvanometer of resistance 10 and that produces maximum deflection for current of 1 mA. Find the value of that have to be used.
Q. The rate of cooling of a body is 0.5C/minute, when the body is 50C above the surrounding. What is the rate of cooling if the body is 30C above the surrounding?
A. 24C/hour
B. 18C/hour
C. 30C/hour
D. 12C/hour
Q). A mixture of gas expands from 0.03 to 0.06 at a constant pressure of 1 MPa and absorbs 84 kJ of heat during the process. The change in internal energy of the mixture is
1. 84 kJ
2. 30 kJ
3. 114 kJ
4. 54 kJ
Q66. A coil when connected to a dc source of 12 V, carries a current of 4 A. If this coil is connected is a ac source of 12 V and 50 rad/s, then it carries a current of 2.4 A. The inductance of the coil is -
(A) 48 H (B) 4 H (3) 12.5 H (4) 8 ×10–2 H
Q45. In a series LCR circuit, the inductive reactance is twice the resistance and the capacitive reactance is the inductive reactance. The power factor of the circuit is
(1) 0.5 (2) 0.6 (3) 0.8 (4) 1
Q47. A radio tuner has a frequency range from 500 KHz to 5 MHz. If its LC circuit has an effective inductance of 400 H, the range of its variable capacitor is (Take = 10)
(1) 250 pF to 2.5 pF (2) 500 pF to 5500 pF (3) 7.5 pF to 750 pF (4) 1000 pF to 10 pF
(1) (2) (3) 1 A (4)
Q23. A condenser of capacity C is charged to a potential difference of V1. The plates of the condenser are then connected to an ideal inductor of inductance L. The current through the inductors when the potential difference access the condenser reduces to V2 is ?
Q25. In an ac circuit an alternating voltage e = 200 sin 100 t volts is connected to a capacitor of capacity 1F. The r.m.s. value of the current in the circuit is :-
(1) 10 mA (2) 100 mA (3) 200 mA (4) 20 m A