Identify the paramagnetic substance
|
(a) Iron |
(b) Aluminium |
(c) Nickel |
(d) Hydrogen |
Identify the paramagnetic substance
|
(a) Iron |
(b) Aluminium |
(c) Nickel |
(d) Hydrogen |
(b) Aluminium
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In Young’s double slit experiment, the distance between the two slits is made half, then the fringe width will become
|
(a) Half |
(b) Double |
(c) One fourth |
(d) Unchanged |
An electron is revolving round a proton, producing a magnetic field of 16 weber/m2 in a circular orbit of radius 1Å. It’s angular velocity will be
|
(a) 1017 rad/sec |
(b) 1/2 π × 1012 rad/sec |
|
(c) 2π × 1012 rad/sec |
(d) 4 π × 1012 rad/sec |
A ray of light incident at an angle θ on a refracting face of a prism emerges from the other face normally. If the angle of the prism is 5º and the prism is made of a material of refractive index 1.5, the angle of incidence is:
A physicist works in a laboratory where the magnetic field is 2 T. She wears a necklace enclosing area 0.01 m2 in such a way that the plane of the necklace is normal to the field and is having a resistance R = 0.01 Ω. Because of power failure, the field decays to 1 T in time 10–3 seconds. Then what is the total heat produced in her necklace ? (T = Tesla)
|
(a) 10 J |
(b) 20 J |
(c) 30 J |
(d) 40 J |
Two transparent slabs have the same thickness as shown. One is made of material A of refractive index 1.5. The other is made of two materials B and C with thickness in the ratio 1 : 2. The refractive index of C is 1.6. If a monochromatic parallel beam passing through the slabs has the same number of waves inside both, the refractive index of B is
|
(a) 1.1 |
(b) 1.2 |
(c) 1.3 |
(d) 1.4 |
The sensitiveness of a moving coil galvanometer can be increased by decreasing
|
(a) The number of turns in the coil |
|
(b) The area of the coil |
|
(c) The magnetic field |
|
(d) The couple per unit twist of the suspension |
With a potentiometer null point were obtained at 140 cm and 180 cm with cells of emf 1.1 V and one unknown X volts. Unknown emf is
|
(a) 1.1 V |
(b) 1.8 V |
(c) 2.4 V |
(d) 1.41 V |