- ATo provide potential energy to electrons
- BTo provide kinetic energy to protons
- CTo provide potential energy to protons
- DTo provide kinetic energy to electrons
Explanation:
In a Cathode ray tube electrons comes out from cathode. After cathode, anode is placed, which as being +ively charged, accelerates electrons and provide them kinetic energy.
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The S.I. unit of radioactivity is
|
(a) Roentgen |
(b) Rutherford |
(c) Curie |
(d) Becqueral |
The radius of a metallic sphere if its capacitance is 1/9 F, is
|
(a) |
(b) |
(c) |
(d) |
A galvanometer of 25 W resistance can read a maximum current of 6mA. It can be used as a voltmeter to measure a maximum of 6 V by connecting a resistance to the galvanometer. Identify the correct choice in the given answers
|
(a) 1025 W in series |
(b) 1025 W in parallel |
(c) 975 W in series |
(d) 975 W in parallel |
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 |
A spectrum is formed by a prism of dispersive power ‘ω’. If the angle of deviation is ‘δ’, then the angular dispersion is
|
(a) ω/δ |
(b) δ / ω |
(c) 1/ ωδ |
(d) ω δ |
Number of electrons in one coulomb of charge will be
|
(a) 5.46 |
(b) 6.25 |
(c) 1.6 |
(d) 9 |
A 100% efficient transformer has 100 turns in the primary and 25 turns in its secondary coil. If the current in the secondary coil is 4 amp, then the current in the primary coil is
|
(a) 1 amp |
(b) 4 amp |
(c) 8 amp |
(d) 16 amp |