NCERT Solutions
Board Paper Solutions
Ask & Answer
School Talk
Login
GET APP
Login
Create Account
Popular
Latest
Expert Answers
ALL
Aparna Sahu
Subject: Physics
, asked on 22/4/18
Solve this:
50.
A gaseous mixture consists of 16 g helium and 16 g of oxygen. The ratio C
p
/C
v
of the mixture is
(A) 1.62 (B) 1.59
(C) 1.54 (D) 1.4
Answer
1
Mitali
Subject: Physics
, asked on 22/4/18
How do we find the moment of inertia of a particle with mass m about the center of a circular disc when it is placed somewhere on it's surface.. let's say on the boundary of the disc..??!
Answer
1
Aparna Sahu
Subject: Physics
, asked on 22/4/18
Solve this :
60. A body of mass M starts siding down on the inclined plane where the critical angle is
∠
ABC
=
30
°
as shown in the figure. The coefficient of kinetic friction will be :
Answer
2
Aparna Sahu
Subject: Physics
, asked on 22/4/18
Solve this :
47. What is the value of the current in a
wire of 10 cm long at the right angle to
uniform magnetic field of 0.5 Weber/m
2
,
when the force acting on toe wire is 5 N?
(a) 1 A
(b) 10 A
(c) 100 A
(d) 1000 A
Answer
2
Laya
Subject: Physics
, asked on 20/4/18
Mention the uses of cyclotron
Answer
1
Megha Prasadan
Subject: Physics
, asked on 20/4/18
6. A heat engine operates at 20 percent efficiency. In each cycle 5.000 joules of waste energy is
exhausted. How much useful work docs this engine produce•during each cycle?
A) 1,000 J
B) 1,250 J
C) 2,500 J
D) 4,000 J
E) 5,000 J
Answer
1
Megha Prasadan
Subject: Physics
, asked on 20/4/18
36. A girl is riding a bicycle at 15 miles per hour due north. A steady wind is blowing at 15 miles per hour from the east. A flag mounted on the bicycle will be stretched out toward the
A) West
B) South
C) South West
D) South East
E) North East
Answer
3
Aparna Sahu
Subject: Physics
, asked on 20/4/18
57. A uniform flexible chain of length 4 m is held on a smooth horizontal table so that 1m overhangs
one edge. The chain being perpendicular to the edge. If the chain be released from rest, the
velocity with which it leaves the table be
(a) 6.06 ms
-l
(b) 6 ms
-l
(c) 9.8 ms
-l
(d) 4.9 ms
-1
Answer
1
Megha Prasadan
Subject: Physics
, asked on 19/4/18
Is the answer e as velocity is 0 so F = qvB = 0?
37. A particle with a charge +Q is at rest in a uniform
magnetic field B. Which of the following correctly
describes the force that field exerts
on the particle?
(A) It is in the same direction as B.
(B) It is in a direction opposite to B.
(C) It is at a right angle to B.
(D) Its direction depends on the magnitudes
of the charge +Q and the field B.
(E) It has a magnitude of zero.
Answer
5
Aparna Sahu
Subject: Physics
, asked on 19/4/18
Solve 7.
Answer
1
Aparna Sahu
Subject: Physics
, asked on 18/4/18
Q.17. A vertical copper disc of diameter 40 cm makes 30 revolutions per second about a horizontal axis passing through its centre. A uniform field
10
-
2
w
b
/
m
2
acts perpendicular to the plane of the disc. Potential difference developed between centre of disc and rim of disc is
(a)
5
.
472
×
10
-
2
V
(b) 1.432
×
10
-
2
V
(c) 3.768
×
10
-
2
V
(d) 6.693
×
10
-
2
V
Answer
1
Muhammad Arafath R Z
Subject: Physics
, asked on 17/4/18
If a current of 1 ampere flows through a equilateral triangle of side 4.5 into 10 power minus 2 m then what is the magnetic field at the centre of the triangle
Answer
1
Jeneeta Eliza John
Subject: Physics
, asked on 17/4/18
Please explain 3 and 4
3.
Magnetic force acting on the charged particle projected perpendicular to magnetic field is proportional to v
n
, where v is the speed. Find n.
4.
Magnetic force acting on the charged particle projected perpendicular to magnetic field is proportional to r
n
, where r is radius of circular path. Find n.
Answer
1
Aparna Sahu
Subject: Physics
, asked on 17/4/18
Q. A conductor of length 1 m moves with a velocity of 50 m s
-1
at an angle 30
°
to the direction of a uniform magnetic field of flux density 1.5 Wb m
-2
. What is the e.m.f induced in the conductor ?
Answer
1
Laieeqa
Subject: Physics
, asked on 17/4/18
Q 52.
A circular coil of radius 10 cm and 100 turns carries a current 1A. What is the magnetic moment of the coil?
1
3
.
142
×
10
4
A
m
2
2
10
4
A
m
2
3
3
.
142
A
m
2
4
3
A
m
2
Answer
3
Prev
1
2
3
4
5
Next
What are you looking for?
50. A gaseous mixture consists of 16 g helium and 16 g of oxygen. The ratio Cp/Cv of the mixture is
(A) 1.62 (B) 1.59
(C) 1.54 (D) 1.4
60. A body of mass M starts siding down on the inclined plane where the critical angle is as shown in the figure. The coefficient of kinetic friction will be :
47. What is the value of the current in a
wire of 10 cm long at the right angle to
uniform magnetic field of 0.5 Weber/m2 ,
when the force acting on toe wire is 5 N?
(a) 1 A
(b) 10 A
(c) 100 A
(d) 1000 A
exhausted. How much useful work docs this engine produce•during each cycle?
A) 1,000 J
B) 1,250 J
C) 2,500 J
D) 4,000 J
E) 5,000 J
A) West
B) South
C) South West
D) South East
E) North East
one edge. The chain being perpendicular to the edge. If the chain be released from rest, the
velocity with which it leaves the table be
(a) 6.06 ms-l
(b) 6 ms-l
(c) 9.8 ms-l
(d) 4.9 ms-1
37. A particle with a charge +Q is at rest in a uniform
magnetic field B. Which of the following correctly
describes the force that field exerts
on the particle?
(A) It is in the same direction as B.
(B) It is in a direction opposite to B.
(C) It is at a right angle to B.
(D) Its direction depends on the magnitudes
of the charge +Q and the field B.
(E) It has a magnitude of zero.
(a)
(b) 1.432
(c) 3.768
(d) 6.693
3. Magnetic force acting on the charged particle projected perpendicular to magnetic field is proportional to vn, where v is the speed. Find n.
4. Magnetic force acting on the charged particle projected perpendicular to magnetic field is proportional to rn, where r is radius of circular path. Find n.