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4,719 questions

Question 1 of 20 4,719 total questions

Question 1631

jamb 1998

The electrochemical equivalent of a metal is 1.3 x 10^-7kgC^-1. The mass of the metal which 2.0 x 10⁴C of electricity will deposit from a suitable electrolyte is

A6.5 x 10^-2kg

B2.6 x 10^-2kg

C6.5 x 10^-3kg

D2.6 x 10^-3kg

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Question 1632

jamb 1998

A transformer which can produce 8V from a 240v a.c. supply, has an efficiency of 80%. If the current in the secondary coil is 15A, calculate the current in the primary coil.

A0.625A

B1.600A

C2.500A

D6.250A

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Question 1633

jamb 1998

Electricity is supplied to a school along a cable of total resistance 0.5\(\Omega\) with the maximum current drawn from the mains as 100A. The maximum energy dissipated as heat for 1 hr is

A3.6 x 10³J

B5.0 x 10³J

C3.0 x 10⁵J

D1.8 x 10⁷J

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Question 1634

jamb 1998

The iron core of an induction coil is made from bundles of wire so as to

Aminimize eddy-currents

Bgenerate eddy-current

Cprevent sparking at the contact breaker

Dget the greatest posible secondary voltage

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Question 1635

jamb 1998

A parallel plate capacitor has a common plate area of 5 x 10\(^{-8}\)m2 and plate separation of 2 x 10\(^{-3}\)m, Assuming free space,

What is the capacitance? [\(\varepsilon\)o = 9.0 X 10-\(^{-12}\)C2N-1m-2]

A2.25 x 10^-17F

B4.50 x 10^-17F

C2.25 x 10^-16F

D4.50 x 10^-16F

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Question 1636

jamb 1998

Find the work done in moving a 2 C charge between two points X and Y in an electric field if the potential difference is 100 volts

A50J

B100J

C200J

D400J

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Question 1637

jamb 1998

Which of the following can be used to reduce local action in a Laclanche cell?

AA carbon rod as the positive pole

BPure zinc as the negative pole

CPotassium permanganate solution in contact with the positive pole

Dcommon salt solution

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Question 1638

jamb 1998

An ebonite rod rubbed with fur attracts a glass rod rubbed with silk because

Aebonite has a negative charge while glass has a positive charge

Bebonite has a positive charge while glass has a negative charge

Cboth have negative charges

Dboth have positive charges

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Question 1639

jamb 1998

The force of repulsion between two point positive charges 5\(\mu\)C and 8\(\mu\)C separated at a distance of 0.02m apart is. [\(\frac{1}{4{\pi}{\varepsilon}_o}\) = 9 x 10\(^9\)Nm\(^2\)C\(^{-2}\)]

A1.8 x 10^-10N

B9.0 x 10^-8N

C9.0 x 10²N

D4.5 x 10³N

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Question 1640

jamb 1998

Which of the following are true about the infra-red radiation? i. it is invisible ii. it is called heat ray iii. its frequency is higher than that of blue light iv. it travels as a transverse wave

Ai, ii, iii and iv

Bi, ii, iv only

Ci, iii, iv only

Dii, iii, iv only

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Question 1641

jamb 1998

A man wears convex lens glasses of focal length 30cm in order to correct his eye defect. instead of the optimum 25cm, his least distance of distinct vision is

A14cm

B28cm

C75cm

D150cm

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Question 1642

jamb 1998

The displacement d produced in a glass block of thickness t and refractive index n when an object is viewed through it is

At – n

Bt (1 + 1/n)

Ct (1-1/n)

Dt (1/n - 1)

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Question 1643

jamb 1998

The most suitable type of mirror used for the construction of the search light is the?

Aconcave mirror

Bconvex mirror

Cspherical mirror

Dparabolic mirror

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Question 1644

jamb 1998

An object is placed in front of two plane mirrors inclined at an angle of 0^o. If the total number of images formed is 7, Find the value of \(\theta\)

A30^o

B45^o

C51^o

D90^o

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Question 1645

jamb 1998

An object 0 lies at a distance m in front of concave mirror of focal length f. If m < f, then the final image obtained will be

Avirtual and diminished

Bmagnified and erect

Creal and inverted

Ddiminished and erect

View Explanation & Discuss

Question 1646

jamb 1998

In a resonance tube experiment, if the fundamental frequency of the vibrating air column is 280Hz, the frequency of the third overtone is

A70Hz

B840Hz

C1120Hz

D1960Hz

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Question 1647

jamb 1998

A steel wire of length 0.50m is stretched between two fixed points and its fundamental frequency is 200Hz. The speed of the wave in the wire is

A100ms^-1

B120ms^-1

C200ms^-1

D250ms^-1

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Question 1648

jamb 1998

In a closed organ pipe producing a musical note, an antinode will always be produced at

Athe closed end

Bthe open end

Cthe middle

Dall the parts of the pipe

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Question 1649

jamb 1998

The physical properties of sound waves can best be described by

Areflection and diffraction

Bpolarization and reflection

Cpolarization and diffraction

Dpolarization and refraction

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Question 1650

jamb 1998

One valid assumption of the kinetic theory of gasses is the

Athe molecules of a gas are constantly in a state of motion and the number of collision remains constant

Bthe number of molecule of gas increases with increasing pressure

Cas the temperature increases, the number of collision made by the gas molecule remains constant

Dthe molecules of gas are all identical and are very small in size

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