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In the figure, an air lens of radii of curvature 10 cm (
= 10 cm) is cut in a cylinder of glass (μ = 1.5). The focal length and the nature of the lens is
|
(a) 15 cm, concave |
(b) 15 cm, convex |
|
(c) ∞, neither concave nor convex |
(d) 0, concave |
A radioactive reaction is 
→ 
. How many α and β particles are emitted
|
(a) 10α, 6β |
(b) 4 protons, 8 neutrons |
|
(c) 6 electrons, 8 protons |
(d) 6β, 8α |
An electric field of 1500 V / m and a magnetic field of 0.40 weber / meter2 act on a moving electron. The minimum uniform speed along a straight line the electron could have is
|
(a) 1.6 × 1015 m / s |
(b) 6 × 10-16 m / s |
(c) 3.75 × 103 m / s |
(d) 3.75 × 102 m / s |
A wire when connected to 220V mains supply has power dissipation 
. Now the wire is cut into two equal pieces which are connected in parallel to the same supply. Power dissipation in this case is 
. Then 
is
|
(a) 1 |
(b) 4 |
(c) 2 |
(d) 3 |
When a thin metal plate is placed in the path of one of the interfering beams of light
|
(a) Fringe width increases |
(b) Fringes disappear |
|
(c) Fringes become brighter |
(d) Fringes becomes blurred |
Peltier co-efficient of a thermo couple is 2 nano volts. How much heat is developed at a junction if 2.5 amp current flows for 2 minute
|
(a) 6 ergs |
(b) 6 |
(c) 16 ergs |
(d) 6 |
