- 1. The S.I unit of inductor is ______
A) Farad
B) OHMS
C) Henry
D) Hertz
- 2. ______ is steady current which will develop the same quality of heat in the same time in the same resistance.
A) Vr.m.s
B) A.C
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 impedance
C) Reactance of the resistor
D) Reactance of the inductor
- 4. ______ is the opposition to the flow of a.c offered by a capacitor or an inductor or both.
A) Capacitance
B) Inductance
C) Resistor
D) Reactance
- 5. The S.I unit of capacitor is _______
A) H2
B) H
C) F
D) OHMS
- 6. The S.I unit of impedance is ______
A) F
B) OHMS
C) H2
D) H
- 7. _______ are atoms with the same atomic number but a different mass number.
A) Isotopes
B) Atomic number
C) Mass number
D) Valence electron
- 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) 5
B) 4
C) 11
D) 6
- 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) 37.5
B) 32.5
C) 35.5
D) 30.5
- 10. An atom X with electron and 30 neutron. Find the proton.
A) 28
B) 2
C) 30
D) 58
- 11. The first concentrated radioactive substance or element is called _____
A) Thorium
B) Uranium
C) Radon and onium
D) Polonium and radium
- 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) X-rats
B) Gramma rays
C) Beta particles
D) Alpha particles
- 13. ______ is the spontaneous decay or disintegration of the nucleus of the atom of an element.
A) Decay constant
B) Half-life
C) Radioactive
D) Radioactivity
- 14. _______ is the time taken for half of the atoms initially present in the element to decay.
A) Half-life
B) Decay
C) Radioactivity
D) Radioactive
- 15. The isotope of a nuclide has a half-life of 5.40 x 103S. Calculate its decay constant.
A) 4.28 x 10-4S-1
B) 1.28 x 10-4S-1
C) 2.28 x 10-4S-1
D) 3.28 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) 10 years
C) 40 years
D) 20 years
- 17. How long will it take until only ⅟4 of the atoms originally present remain unchanged.
A) 30 years
B) 40 years
C) 20 years
D) 10 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) 100 days
B) 200 days
C) 150 days
D) 250 days
- 19. The phenomenon of radioactivity was first discovered by _____
A) Marie Curve
B) Niels Bohr
C) Sir J. J. Thompson
D) Henri Becquerel
- 20. Beta particles are fast moving.
A) Neutrons
B) Protons
C) Electrons
D) Protons
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