Water is heated from 0° C to 10° C, then its volume
does not change
decreases
first decreases and then increases
increases
The efficiency of a Carnot engine which operates between the two temperatures T1 = 500 K and T2 = 300 K is
75 %
50 %
40 %
25 %
The ratio of hydraulic stress to the corresponding strain is known as
Young's modulus
compressibility
Rigidity modulus
Bulk's modulus
A stretched string is vibrating in the second overtone, then the number of nodes and anti-nodes between the ends of the string are respectively
3 and 4
4 and 3
2 and 3
3 and 2
When two tuning forks A and B are sounded together, 4 beats per second are heard. The frequency of the fork B is 348 Hz. When one of the prongs of the fork A is filled and sounded with B, the beat frequency increases, then the frequency of the fork A is
379 Hz
380 Hz
389 Hz
388 Hz
If there is no torsion in the suspension thread, then the time period of a magnet executing SHM is
The circuit has two oppositely connected ideal diodes in parallel. What is the current flowing in the circuit ?
2.31 A
1.71 A
1.33 A
2.0 A
B.
1.71 A
In the given circuit, D1 is forward biased and D2 is reverse biased So, D1 works like a closed switch and D2 works like an open circuit. So, circuit becomes
The angle between the dipole moment and electric field at any point on the equatorial plane is
180°
0°
45°
90°
Pick out the statement which is incorrect ?
A negative test charge experiences a force opposite to the direction of the field
The tangent drawn to a line of force represents the direction of electric field
Field lines never intersect
The electric field lines forms closed loop
Two spheres carrying charges + 6 µC and + 9 µC, separated by a distance d, experiences a force of repulsion F. When a charge of −3 μC is given to both the spheres and kept at the same distance as before, the new force of repulsion is
F
3F