A solid reflects incident light and it’s electrical conductivity decreases with temperature. The binding in this solids
|
(a) Ionic |
(b) Covalent |
(c) Metallic |
(d) Molecular |
(c) Metallic
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If half life of radium is 77 days. Its decay constant in day will be
|
(a) 3 |
(b) |
(c) 1 |
(d) 6 |
A flake of glass (refractive index 1.5) is placed over one of the openings of a double slit apparatus. The interference pattern displaces itself through seven successive maxima towards the side where the flake is placed. if wavelength of the diffracted light is λ = 600nm, then the thickness of the flake is
|
(a) 2100 nm |
(b) 4200 nm |
(c) 8400 nm |
(d) None of these |
As shown in the figure a metal rod makes contact and complete the circuit. The circuit is perpendicular to the magnetic field with B = 0.15 tesla. If the resistance is 3Ω, force needed to move the rod as indicated with a constant speed of 2m/sec is
|
(a) 3.75 |
(b) 3.75 |
(c) 3.75 |
(d) 3.75 |
When the speed of a dc motor increases the armature current
|
(a) Increases |
|
(b) Decreases |
|
(c) Does not change |
|
(d) Increases and decreases continuously |
In extrinsic P and N-type, semiconductor materials, the ratio of the impurity atoms to the pure semiconductor atoms is about
|
(a) 1 |
(b) |
(c) |
(d) |
Isogonic lines on magnetic map will have
|
(a) Zero angle of dip |
(b) Zero angle of declination |
|
(c) Same angle of declination |
(d) Same angle of dip |
An electric lamp is marked 60 W, 230 V. The cost of 1 kilowatt hour of power is Rs. 1.25. The cost of using this lamp for 8 hours is
|
(a) Rs. 1.20 |
(b) Rs. 4.00
|
(c) Rs. 0.25 |
(d) Rs. 0.60 |
