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4,719 questions

Question 1 of 20 4,719 total questions

Question 1731

waec 1995

Which of the following are emitted from a radioactive substance without altering either the nucleon number or the proton number of the substance?

AProtons

BNeutrons

CGamma rays

DBeta particles

EAlpha particles

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Question 1732

waec 1995

A moving-coil meter with an internal resistance of 100 Ω has a full-scale deflection when a current of 10 mA flows through it. What value of resistance would convert it to read 10 V at full-scale deflection?

A20

B100

C600

D900

E1000

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Question 1733

waec 1995

A radioactive nuclide of mass 6.09 has a half-life of 8 days. Calculate the time during which 5.25g of the nuclide would have decayed

A1 day

B2 days

C8 days

D24 days

E42 days.

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Question 1734

waec 1995

Which of the following statements are not true of a moving-coil milliammeter? I. It can be used to measure alternating current II. It has a linear scale III. It can be adapted to read higher values of currents IV. A resistor connected in parallel with the milliammeter would convert it to a voltmeter

AI and IV only

BII and III only

CIII and IV only

DI, II and III only

EI, III and IV only

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Question 1735

waec 1995

A cell of e.m.f 1.5V and internal resistance 2.552 is connected in series with an ammeter resistance 0.50 and a load of resistance 7.00. Calculate the current in the circuit

A0.15A

B0.20A

C2.1OA

D3.00A

E6.67A

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Question 1736

waec 1995

Which of the following is a wind instrument?

AGuitar

BOrgan

CViolin

DPiano

EHarp

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Question 1737

waec 1995

Calculate the current in the 30 resistor in the diagram above if the battery is of negligible internal resistance

A0.3A

B0.4A

C1.0A

D1.5A

E2.5A

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Question 1738

waec 1995

What is the potential difference between X and Y in the diagram above if the battery is of negligible internal resistance

A12.5V

B5.8V

C5.0V

D3.0V

E2.0V

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Question 1739

waec 1995

An alternating current, having the waveform shown in the diagram above, is represented by the equation x = X_o sinwt. Which of the following represents X_o?

AOS

BOR

CPQ

DRT

EOT

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Question 1740

waec 1995

Calculate the quantity charge flowing through a conductor if a current of 10A passes through the conductor for 10s.

A100C

B20C

C15C

D10C

E1C

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Question 1741

waec 1995

The effective capacitance between points X and Y in the diagram below is 1.0μF, What is the value of the capacitance C, measured in micro-farad?

A5.0μF

B4.0μF

C3.0μF

D1.0μF

E0.5μF

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Question 1742

waec 1995

The energy stored in a capacitor of capacitance 5μF is 40J. Calculate the voltage applied across its terminals?

A4000V

B200V

C16V

D6V

E4V

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Question 1743

waec 1995

A capacitor of capacitance 25μF is connected to an a.c. power source of frequency 200 Hz. Calculate the reactance of the capacitor

A0.01

B0.02

C50.00

D100.00

E200.00.

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Question 1744

waec 1995

If the current in the resistor R in diagram above is 0.05A, calculate the p.d. across the inductor.

A2.5V

B25.0V

C49.0V

D50.0V

E250.0V

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Question 1745

waec 1995

Calculate the inductive reactance of the circuit shown above.

A50.00

B5.00

C0.50

D0.05

E0.02

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Question 1746

waec 1995

Calculate the electric potential at a distance of 20.0cm from a point charge of 0.015C placed in air of permittivity (Take \(\frac{1}{4πεo}\) as 9.0 x 10\(^9\) Nm\(^2\)C\(^2\))

A3.40x10⁶V

B6.75x10⁸V

C6.75x10¹²V

D3.40x10⁵V

E8.30 x 10²V

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Question 1747

waec 1995

Calculate the inductance L of the coil in the circuit shown below.

A14.4H

B3.8H

C0.6H

D0.4H

E0.2H

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Question 1748

waec 1995

A balloon containing 546cm³ of air is heated from 0^oC to 10^oC. If the pressure is kept constant, what will be its volume at 10^oC?

A526cm³

B546cm³

C556cm

D566cm³

E819cm³

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Question 1749

waec 1995

A charge of 1.6 x 10^-10C is placed in a uniform electric field of intensity 2.0 x 10⁵NC^-1. What is the magnitude of the electric force exerted on the charge?

A3.2 x10⁵N

B1.8 x10⁵N

C3.2 x10^-5N

D1.8 x10^-5N

E4.0X10^-6N

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Question 1750

waec 1995

What is the escape velocity of a body on the surface of the earth of radius R if the gravitational constant is G and the mass of the earth is M? (Neglect energy losses to the surroundings)

A2GR

B2G/R

C2GR²

D\(\sqrt{\frac{2GM}{R}}\)

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