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Past Questions

46 questions

Question 1 of 20 46 total questions

Question 1

jamb 1981

in a light experiment with a convex lens a student plotted a graph as shown above of the reciprocal of object distance (1)/u against the reciprocal of image distance (1)/v . the focal length of the lens is given as

Aslope of line PQ

BReciprocal of either OP or OQ

CLength OP or OQ

Darea under the graph E ratio OP/OQ

View Explanation & Discuss

Question 2

jamb 1981

The wave motion above has a frequency

A0.1Hz

B0.2Hz

C5Hz

D10Hz

E100Hz

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Question 3

jamb 1981

The effect of closing the key K in the circuit shown above would be to

Aincrease the current by 0.6A

Breduce the current by 0.6A

Cincrease the current by 0.4A

Dkeep the current unchanged

View Explanation & Discuss

Question 4

jamb 1981

A body of mass 6kg rests on an inclined plane. The normal reaction is R, and the limiting frictional force is F as shown in the image above. if F = 30N, and g = 10ms\(^{-2}\) then the angle of inclination \( \theta \) is

A15\(^o\)

B30\(^o\)

C45\(^o\)

D60\(^o\)

E75\(^o\)

View Explanation & Discuss

Question 5

jamb 1981

A solid weighs 4.8g in air, 2.8g in water and 3.2g in kerosine. The ratio of density of the solid to that of the kerosine is

A12

D\(\frac{3}{2}\)

E\(\frac{5}{4}\)

View Explanation & Discuss

Question 6

jamb 1981

If I is the current passing through a metallic resistor and H is the rate of Heat generated in the resistor at a constant temperature, then

AH \(\alpha\) \(\frac{1}{I}\)

BH \(\alpha\) \(\frac{1}{I^2}\)

CH \(\alpha\) \(\sqrt1\)

DH \(\alpha\) I²

Enone of the above

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Question 7

jamb 1981

A closed coil of wire is placed near a magnet. The magnet lies along the axis of the coil. Under which of the following conditions would there be no current in the coil?

AWhen the coil is moved toward the stationary magnet

BWhen the coil is moved away from the stationary magnet

Cwhen the coil is held stationary but the magnet is moved towards the coil

Dwhen both the coil and the magnet are held stationary

Ewhen the coil is held stationary but the magnet is moved away from the cell

View Explanation & Discuss

Question 8

jamb 1981

A transformer has 300 turns of wire in the primary coil and 30 turns in the secondary coil.If the input voltage is 100 volts, the output voltage is

A5 volts

B10 volts

C15 volts

D20 volts

E25 volts

View Explanation & Discuss

Question 9

jamb 1981

The relationship between the period T and the length l of a simple pendulum is T = 2\( \pi \) \( ( \frac{I}{g}) ^{ \frac{1}{2} } \). From experiment data of T and I, one can obtain the following graphs, i. T vs.I ii. T vs I2 iii. T2 vs. I iv. T vs \( \sqrt{I} \) v. logT vs logI. Which of the following graphs, are linear?

Aall

Bonly i and ii

Conly iii and iv

Diii, iv and v

Enone of them

View Explanation & Discuss

Question 10

jamb 1981

Which of the following is NOT directly associated with direct current (DC)?

AA dry cell

Ba moving coil galvanometer

Ca transformer

Da lead- acid accumulator

Ea commutator

View Explanation & Discuss

Question 11

jamb 1981

The extension in a spring when 5g wt was hung from it was 0.56cm. If Hooke's law is obeyed, What is the extension caused by a load of 20g wt?

A1.12m

B2.14cm

C2.52cm

D2.80cm

E2.24cm

View Explanation & Discuss

Question 12

jamb 1981

A liquid-in-glass thermometer should quickly register temperature changes. This is achieved by choosing a liquid that

Ais opaque

Bhas high density

Chas regular expansion

Dhas a high thermal conductivity

Ecan wet glass

View Explanation & Discuss

Question 13

jamb 1981

An object placed on the principle axis of a convex lens of focal length 10m produces a real image of double magnification. The image distance from the lens is

A30cm

B25cm

C20cm

D15cm

E10cm

View Explanation & Discuss

Question 14

jamb 1981

The mass of a proton is approximately equal to that of

Aan \(\alpha\)-particle

Ba \(\beta\)-particle

C\(\gamma\)-ray

Dan electron

Ea neutron

View Explanation & Discuss

Question 15

jamb 1981

The quantity (timbre) of sound depends on

Aamplitude

Bfrequency

Charmonics

Dvelocity

Ewavelength

View Explanation & Discuss

Question 16

jamb 1981

Change of state is accompanied by change of?

Atemperature

Bvolume

Cheat content

Dtemperature and volume

Evolume and heat content

View Explanation & Discuss

Question 17

jamb 1981

a balloon inflated with helium gas at ground level is released. As it rises through a constant temperature atmosphere.

Aits pressuren reduces but volume remains constant

Bte product of pressure and volume remains constant

Cboth pressure and volume increases

Dits pressure remains constant but the volume decreases

Eboth pressure and volume remains constant

View Explanation & Discuss

Question 18

jamb 1981

Two particles X and Y starting from rest cover the same distance. The acceleration of X is twice that of Y. the ratio of the time taken by X to that taken by Y is

A\(\frac{1}{2}\)

B\(\frac{2}{\sqrt2}\)

C\(\frac{1}{\sqrt2}\)

D\(\sqrt 2\)

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Question 19

jamb 1981

Alternating current can induce voltage because it has a

Aripple value

Bvarying magnetic field

Cweaker magnetic field than direct current

Dstonger magnetic field than direct current

Ehigh peak value

View Explanation & Discuss

Question 20

jamb 1981

A body falls freely under gravity (g = 9.8ms-2) from a height of 40m on to the top of a platform 0.8m above the ground. Its velocity on reaching the platform is

A784ms^-1

B80ms^-1

C78.4ms^-1

D39.2ms^-1

E27.7ms^-1

View Explanation & Discuss

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