- ✓$\frac{1}{2} CV ^2$
- B$CV ^2$
- C$\frac{C V^2}{3}$
- D$\frac{1}{2} QV ^2$
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
An electron is moving with constant velocity along x - axis. If a uniform electric field is applied along y- axis, then its path in the x - y plane will be
|
(a) A straight line |
(b) A circle |
(c) A parabola |
(d) An ellipse |
A free neutron decays into a proton, an electron and
|
(a) A neutrino |
(b) An antineutrino |
(c) An alpha particle |
(d) A beta particle |
The focal lengths of the objective and eye-lens of a microscope are 1 cm and 5 cm respectively. If the magnifying power for the relaxed eye is 45, then the length of the tube is
|
(a) 30 cm |
(b) 25 cm |
(c) 15 cm |
(d) 12 cm |
The direction of magnetic lines of forces close to a straight conductor carrying current will be
|
(a) Along the length of the conductor |
|
(a) Along the length of the conductor |
|
(c) Circular in a plane perpendicular to the conductor |
|
(d) Helical |
The speed of an electron having a wavelength of
is
|
(a) 7.25 |
(b) 6.26 |
(c) 5.25 |
(d) 4.24 |
The radioactivity of a certain radioactive element drops to 1/64 of its initial value in 30 seconds. Its half life is
|
(a) 2 seconds |
(b) 4 seconds |
(c) 5 seconds |
(d) 6 seconds |

In a transformer, the coefficient of mutual inductance between the primary and the secondary coil is 0.2 henry. When the current changes by 5 ampere/second in the primary, the induced e.m.f. in the secondary will be
|
(a) 5 V |
(b) 1 V |
(c) 25 V |
(d) 10 V |