The error in measuring the current with a tangent galvanometer is minimum when the deflection is about
|
(a) 0o |
(b) 30o |
(c) 45o |
(d) 60o |
The error in measuring the current with a tangent galvanometer is minimum when the deflection is about
|
(a) 0o |
(b) 30o |
(c) 45o |
(d) 60o |
(c) 45o
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
If the operating potential of an X-ray tube is 50 kV, the velocity of X-rays coming out of it is
|
(a) 4 |
(b) 3 |
(c) |
(d) 3 m/s |
A circular coil of radius 5 cm has 500 turns of a wire. The approximate value of the coefficient of self induction of the coil will be
|
(a) 25 millihenry |
(b) 25 |
|
(c) 50 |
(d) 50 |
Change Q on a capacitor varies with voltage V as shown in the figure, where Q is taken along the X-axis and V along the Y-axis. The area of triangle OAB represents
|
(a) Capacitance |
(b) Capacitive reactance |
|
(c) Magnetic field between the plates |
(d) Energy stored in the capacitor |
In a Thomson set-up for the determination of e/m, electrons accelerated by 2.5 kV enter the region of crossed electric and magnetic fields of strengths 3.6
and 1.2
respectively and go through undeflected. The measured value of e/m of the electron is equal to
|
(a) 1.0 |
(b) 1.76 |
(c) 1.80 |
(d) 1.85 |
$=\text{R}$
$\le\text{R}$
$>\text{R}$
$\ge\text{R}$
Assertion : The setting sun appears to be red.
Reason : Scattering of light is directly proportional to the wavelength.
|
(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
|
(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
|
(c) If assertion is true but reason is false. |
|
(d) If the assertion and reason both are false. |
When a
atom is bombarded with α - particles, one of the product of nuclear transmutation is
. The other is
|
(a) |
(b) |
(c) |
(d) |
If a coil made of conducting wires is rotated between poles pieces of the permanent magnet. The motion will generate a current and this device is called
|
(a) An electric motor |
(b) An electric generator |
|
(c) An electromagnet |
(d) All of above |
A thin lens is made with a material having refractive index $\mu=1.5.$ Both the sides are convex. It is dipped in water $(\mu=1.33).$ It will behave like: