- AStatic current
- BConventional current
- CElectronic current
- DPotential current
Explanation:
The carriers of electric current are electrons. The current in a circuit is due to the flow of electrons. Therefore, the direction of the conventional current is opposite to the direction of flow of electrons.
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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 |
A thin plano-convex lens acts like a concave mirror of focal length 0.2 m when silvered from its plane surface. The refractive index of the material of the lens is 1.5. The radius of curvature of the convex surface of the lens will be
|
(a) 0.4 m |
(b) 0.2 m |
(c) 0.1 m |
(d) 0.75 m |
A nucleus of atomic mass A and atomic number Z emits β - particles. The atomic mass and atomic number of the resulting nucleus are
|
(a) A, Z |
(b) A + 1, Z |
(c) A, Z + 1 |
(d) A – 4, Z - 2 |
The principle of controlled chain reaction is used in
| (a) Atomic energy reactor | (b) Atom bomb |
|
(c) The core of sun |
(d) Artificial radioactivity |
Assertion : Isobars are the element having same mass number but different atomic number.
Reason : Neutrons and protons are present inside nucleus.
|
(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. |
In the circuit shown in figure, the heat produced in 5 ohm resistance is 10 calories per second. The heat produced in 4 resistance is
|
(a) 1 cal / sec |
(b) 2 cal/sec |
(c) 3 cal / sec |
(d) 4 cal/sec |