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Past Questions

45 questions

Question 1 of 20 45 total questions

Question 1

jamb 1989

A beam of radiation is passed between a pair of charged plates as indicated in the fig above. Beam P is undetected While Q is deflected to the left. P and Q respectively should be

I.γ-rays β-rays
II. x-rays β-rays
III. γ-rays x-rays
IV. x-rays x-rays

AI only

BIII only

CI and II

DIII and IV

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Question 2

jamb 1989

The fig above shows a conductor PQ carrying a current I in the direction shown. At a particular position near the conductor is a compass needle K. Neglecting the earth's magnetic field, the compass needle will

Asettle in any direction

Bsettle in a fixed direction only if the conductor PQ is a magnetic material

Csettle in a fixed direction WHETHER the conductor PQ is a magnetic material OR NOT

Dbe stationary

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Question 3

jamb 1989

The total power drawn from the cell in the circuit above is

A12W

B24W

C32W

D40W

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Question 4

jamb 1989

Three 2-µF capacitors are arranged as seen in the circuit above . The effective capacitance between E and F is

A0.75µF

B1.33µF

C3.00µF

D6.00µF

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Question 5

jamb 1989

In the above circuit diagrams A is the ammeter and V is the Voltmeter. Which of the circuits is correct for finding the correct value of the resistance R

BII

CIII

DIV

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Question 6

jamb 1989

The air column as shown above is set into vibration by the turning fork. In this State of resonance, the waves in the air column will be

Astationary and transverse

Bstationary and longitudinal

Cprogressive and transverse

Dprogressive and longitudinal

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Question 7

jamb 1989

In the fig above W\(_1\) = 200g, and W\(_2\) =450g. Calculate the extension of the spring per unit load.
[g = 10ms\(^{-2}\)]

A6.0 x 10^-5mN^-1

B2.5 x 10^-4mN^-1

C6.0 x 10 ^-3mN^-1

D2.5 x 10 ^-2mN^-1

View Explanation & Discuss

Question 8

jamb 1989

A block of mass m is held in equilibrium against a vertical wall by a horizontal force. If the coefficient of friction between the wall and the block is µ, the minimum value of the horizontal force is

Aµmg

B(1-µ)mg

C(1+µ)mg

Dmg/µ

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Question 9

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 10

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 11

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 12

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 13

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 14

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 15

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 16

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 17

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 18

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 19

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

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Question 20

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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