- 1. The S.I unit of inductor is ______
A) OHMS
B) Hertz
C) Henry
D) Farad
- 2. ______ is steady current which will develop the same quality of heat in the same time in the same resistance.
A) A.C
B) Vr.m.s
C) D.C
D) /r.m.s
- 3. The opposition in ohms of an inductor to the flow of A.C is called _________
A) Reactance of the capacitor
B) Reactance of the inductor
C) Reactance of impedance
D) Reactance of the resistor
- 4. ______ is the opposition to the flow of a.c offered by a capacitor or an inductor or both.
A) Capacitance
B) Inductance
C) Reactance
D) Resistor
- 5. The S.I unit of capacitor is _______
A) F
B) H
C) OHMS
D) H2
- 6. The S.I unit of impedance is ______
A) F
B) H
C) OHMS
D) H2
- 7. _______ are atoms with the same atomic number but a different mass number.
A) Mass number
B) Isotopes
C) Valence electron
D) Atomic number
- 8. An atom of 2 has mass number of 11 and atomic number of 5. How many neutrons are there in an atom of 2 ?
A) 6
B) 4
C) 5
D) 11
- 9. There are two isotopes of chlorine with mass number 25 and 37 respectively. If the isotopes exist in the ration 3:1, the lighter isotope being the more abundant. What is the relative atomic mass of chlorine?
A) 30.5
B) 35.5
C) 32.5
D) 37.5
- 10. An atom X with electron and 30 neutron. Find the proton.
A) 2
B) 30
C) 58
D) 28
- 11. The first concentrated radioactive substance or element is called _____
A) Polonium and radium
B) Uranium
C) Thorium
D) Radon and onium
- 12. _______ is the type of radiation that deflected in a direction showing that consist of positively charged particles and bent towards the negative electric plates.
A) Beta particles
B) Alpha particles
C) Gramma rays
D) X-rats
- 13. ______ is the spontaneous decay or disintegration of the nucleus of the atom of an element.
A) Radioactivity
B) Half-life
C) Decay constant
D) Radioactive
- 14. _______ is the time taken for half of the atoms initially present in the element to decay.
A) Decay
B) Radioactivity
C) Half-life
D) Radioactive
- 15. The isotope of a nuclide has a half-life of 5.40 x 103S. Calculate its decay constant.
A) 2.28 x 10-4S-1
B) 1.28 x 10-4S-1
C) 3.28 x 10-4S-1
D) 4.28 x 10-4S-1
- 16. A certain radioactive element has a half-life of 10 years.
How long will it take to lose ⅞ of its atoms originally present?
A) 30 years
B) 40 years
C) 10 years
D) 20 years
- 17. How long will it take until only ⅟4 of the atoms originally present remain unchanged.
A) 20 years
B) 10 years
C) 30 years
D) 40 years
- 18. The time it will take a certain radioactive material with a half-life of 50 days to reduce to ⅟32 of its original number is ______
A) 250 days
B) 200 days
C) 100 days
D) 150 days
- 19. The phenomenon of radioactivity was first discovered by _____
A) Niels Bohr
B) Marie Curve
C) Henri Becquerel
D) Sir J. J. Thompson
- 20. Beta particles are fast moving.
A) Protons
B) Electrons
C) Neutrons
D) Protons
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