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77 questions

Question 1 of 20 77 total questions

Question 21

jamb 1989

A simple pendulum of mass m moves along an arc pf a circle radius R in a vertical plane as shown above. What is the work done by gravity in a downward swing through the angle q to 0 degree

AmgR sinθ

BMgR (1- cos θ)

CmgR

DmgR (1 - sinθ)

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Question 22

jamb 1989

The fig above shows a uniform circular object, center R and diameter PS. A circular section 6 and Diameter PR is cut from it. if PQRS is a straight line, where is center of gravity of the figure

CA point between P and R

DA point between R and S

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Question 23

jamb 1989

The function of a 5-A fuse included in a circuit supplying a household refrigerator with power is to keep the

ATemperature of the refrigerator low and constant

Bkeep current supplied to the refrigerator below 5A

CVoltage supply constant

DCurrent supplies to the refrigeration

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Question 24

jamb 1989

An object is placed at 5.6 x 10\(^{-4}\)m in front of a converging lens of focal length 1.0 x 10\(^{-n}\)m. The image formed is

AReal, Erect and magnified

BVirtual, erect and magnified

CReal, inverted and magnified

DVirtual, erect and diminished

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Question 25

jamb 1989

Eight alpha decays and six beta decays are necessary before an atom of 2 \(^{238}_{92}U\) achieves stability. The final product in the chain has an atomic number of

A70

B78

C82

D90

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Question 26

jamb 1989

Which of the following is TRUE of the particles emitted in radioactive disintegration?

Athe beta particle is the helium nucleus H

Bthe alpha particle is lighter than the beta particle

Cthe alpha particle is deflected more than the beta particle in a magnetic field

Dthe beta particle is deflected more than the alpha particle in a magnetic field

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Question 27

jamb 1989

When a radiation strikes a metal surface, electrons may be ejected from the metal. The maximum kinetic energy which may be acquired by an ejected electron depend on the

Aintensity of the radiation

Bsource of the radiation

Cwavelength of the radiation

Ddetection device of the electron

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Question 28

jamb 1989

The electrochemical equivalent of silver is 0.0012gC^-1. If 36.0g of silver is to be deposited by electrolysis on a surface by passing a steady current for 5.0mins, the current must be

A6000A

B100A

C10A

D1A

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Question 29

jamb 1989

An ammeter of resistance 1.0\(\Omega\) has a full-scale deflection of 50mA. Determine the resultant full-scale deflection of the meter when a shunt of 0.0111\(\Omega\) is connected across its terminals.

A400mA

B450mA

C500mA

D550mA

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Question 30

jamb 1989

A calibrated potentiometer is used to measure the e.m.f. of a cell because the

Ainternal resistance of a cell is small compared with that of the potentiometer

Bpotentiometer has a linear scale

Cpotentiometer takes no current from the cell

Dresistance of the potentiometer is less than that of a voltmeter

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Question 31

jamb 1989

Three resistors, with substances 250\(\Omega\), 500\(\Omega\) and 1k\(\Omega\) are connected in series. A 6V battery is connected to either end of the combination. Calculate the pot3ential difference between the end of the 250\(\Omega\) resistor.

A0.20V

B0.86V

C1.71V

D3.43V

View Explanation & Discuss

Question 32

jamb 1989

The resistance of a 5m uniform wire of cross-sectional area 0.2 x 10-6m2 is 0.425. What is the resistivity of the material of the wire?

A1.10 x 10^-6\(\Omega\)m

B4.25 x 10^-6\(\Omega\)m

C2.40 x 10^-7\(\Omega\)m

D1.70 x 10^-8\(\Omega\)m

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Question 33

jamb 1989

A bar magnet is most effectively demagnetized by

Aplacing it in a N - S position and hitting it with a hammer

Bsubjecting it to an electric current from a battery

Cbringing its north pole in contact with the north pole of a very strong magnet

Dheating the magnet

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Question 34

jamb 1989

When a number of identical small magnets are arranged in a line, the strength of the resultant magnet

Aia largest when they are arranged end to end

Bis greatest when they are arrangedparallel with like poles adjacent to each other

Cdepends only on the number of magnets provided they arev parallel

Dis greater when the magnets are arranged on a wooden surface than on a metaln surface

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Question 35

jamb 1989

Two insulated charged spheres of different sizes and carrying opposite charges are connected together by a metallic conductor. Current will flow from one sphere to the other until both sphere

Acarry the same magnitude and sign of charge

Bare at the same potential

Care at the same temperature

Dare of the same size

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Question 36

jamb 1989

Which of the following pairs is NOT part of the electromagnetic spectrum? i. Radio waves. ii. Beta rays. iii. Gamma rays. iv. Alpha rays

Ai and ii

Biii and iv

Ci and ii

Dii and iv

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Question 37

jamb 1989

Dispersion of light by a glass prism is due to the

Adifferent colours of the glass

Bdifferent speeds of the various colours in glass

Cdefects in the glass

Dhigh density of glass

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Question 38

jamb 1989

When a yellow card is observed through a blue glass, the card would appear.

Ablack

Bgreen

Cred

Dwhite

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Question 39

jamb 1989

A far sighted person cannot see objects that are less than 100cm away. If this person wants to read a book at 25cm, what type and focal length of lens does he need?

Aconvex, 20cm

Bconcave, 20cm

Cconvex, 33cm

Dconcave, 33cm

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Question 40

jamb 1989

The plane mirrors in a kaleidoscope are usually placed

Aat an angle of 60^o

Bparallel to one another

Cperpendicular to one another

Dat an angle of 45^o

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