- AA force but not a torque.
- BA torque but not a force.
- CAlways a force and a torque.
- DNeither a force nor a torque.
Explanation:
Electric dipole,
Two equal and opposite charges seperated by small distance.
Wherein,

As the dipole will feel two forces which are although opposite but not equal.
A net force will be there and as these forces act at different points of a body. A torque is also there.
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mesons can be
|
(a) |
(b) |
(c) |
(d) |
In a compound microscope magnification will be large, if the focal length of the eye piece is
|
(a) Large |
(b) Smaller |
|
(c) Equal to that of objective |
(d) Less than that of objective |
A and B are two radioactive substances whose half lives are 1 and 2 years respectively. Initially 10 gm of A and 1 gm of B is taken. The time (approximate) after which they will have same quantity remaining is
|
(a) 6.62 years |
(b) 5 years |
(c) 3.2 years |
(d) 7 years |
The velocity of photon is proportional to (where n is frequency)
|
(a) |
(b) |
(c) |
(d) n |
The composition of an a -particle can be expressed as
|
(a) 1 P + 1 N |
(b) 1 P + 2 N |
(c) 2 P + 1 N |
(d) 2 P + 2 N |
A wheel with ten metallic spokes each 0.50 m long is rotated with a speed of 120 rev/min in a plane normal to the earth’s magnetic field at the place. If the magnitude of the field is 0.4 Gauss, the induced e.m.f. between the axle and the rim of the wheel is equal to
|
(a) |
(b) |
(c) 1.256 |
(d) 6.28 |
Which of the following is not a correct statement
|
(a) Resistivity of electrolytes decreases on increasing temperature |
|
(b) Resistance of mercury falls on decreasing its temperature |
|
(c) When joined in series a 40 W bulb glows more than a 60 W bulb |
|
(d) Resistance of 40 W bulb is less than the resistance of 60 W bulb |
A primary cell has an e.m.f. of 1.5 volts, when short-circuited it gives a current of 3 amperes. The internal resistance of the cell is
|
(a) 4.5 ohm |
(b) 2 ohm |
(c) 0.5 ohm |
(d) 1/4.5 ohm |