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2,483 questions

Question 1 of 20 2,483 total questions

Question 881

jamb 1993

If the focal length of a camera lens is 20cm, the distance from the film at which the lens must be set to produce a sharp image of an object 100cm away is

A17cm

B20cm

C25cm

D100cm

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Question 882

jamb 1993

Which of the following expressions gives the linear magnification produced by a concave mirror of radius of curvature r, if U and V are the object and image distances respectively?

A\(\frac{V}{r}\) - 1

B\(\frac{2V}{r}\) - 1

C\(\frac{U}{r}\) - 1

D\(\frac{2U}{r}\) - 1

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Question 883

jamb 1993

Radio waves emitted from an antenna are picked up by a radar after reflection from an aircraft in 4 x 10\(^{-3}\)S. How far is the aircraft from the antenna? [c = 3 x 10\(^8\)ms\(^{-1}\) ]

A6.0 x 10\(^2\)km

B1.2 x 10³km

C3.0 x 10³km

D6.0 x 10 ⁵km

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Question 884

jamb 1993

Which of the following waves can propagate through a vacuum?

AHigh velocity sound waves

BUltrasonic waves

CAcoustic waves

DInfra-red waves

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Question 885

jamb 1993

Determine the distance between the consecutive antinodes XX if the wavelength is 60cm

A15cm

B30cm

C60cm

D120cm

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Question 886

jamb 1993

The relationship between L and the wavelength I of the stationary wave is

A2L = \(\lambda\)

BL = \(\lambda\)

CL = \(\frac {\lambda}{3}\)

D4L = 3 \(\lambda\)

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Question 887

jamb 1993

200g of water at 90°C is mixed with 100g of water at 30°C. What is the final temperature?

A50^oC

B60^oC

C70^oC

D80^oC

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Question 888

jamb 1993

When the volume of a given mass of gas is halved and its temperature doubled, the pressure

Aremains constant

Bincreases by a factor of 4

Cincreases by a factor of 3

Ddecreases by a factor of 4

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Question 889

jamb 1993

A metal rod 800mm long is heated from 10^oC to 95^oC. If it expands by 1.36mm, the linear expansivity of the metal is

A2.0 x 10²K^-1

B2.0 x 10²K^-1

C5.0 x 10^-3K^-1

D2.0 x 10^-5K^-1

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Question 890

jamb 1993

The thermometric properties of the thermocouple is that is

Ae.m.f. changes with temperature

Bresistance changes with temperature

Cvolume changes with temperature

Dpressure changes with resistance

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Question 891

jamb 1993

An object of mass 400g and density 600kgm^-3 is suspended with a sting so that half of it is immersed in paraffin of density 900kgm^-3. The tension in the string is

A1.0N

B3.0N

C4.0N

D5.0N

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Question 892

jamb 1993

A weightless vessel of dimensions 4m x 3m x 2m is filled with a liquid of density 1000kgm\(^{-3}\) and sealed. What is the maximum pressure this container can exert on a flat surface? [g = 10ms\(^{-2}\)]

A9 x 10⁴Nm^-2

B4 x 10⁴Nm^-2

C3 x 10⁴Nm^-2

D2 x 10⁴Nm^-2

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Question 893

jamb 1993

A plane inclined at angle \(\theta\) has a velocity ratio of 10 : 1. The inclination of the plane to the horizontal is given by

Atan\(\theta\) = \(\frac{1}{10}\)

Bcot\(\theta\) = \(\frac{1}{10}\)

Ccos\(\theta\) = \(\frac{1}{10}\)

Dsin\(\theta\) = \(\frac{1}{10}\)

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Question 894

jamb 1993

Which of the following correctly describes the energy changes in the generation of light by a hydroelectric power station?

AElectrical \(\to\) mechanical \(\to\) potential

Bpotential \(\to\)mechanical \(\to\)electrical \(\to\) light

Cmechanical \(\to\) sound \(\to\) electrical \(\to\) light

Dkinetic \(\to\) mechanical \(\to\) electrical \(\to\)light

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Question 895

jamb 1993

The force experienced by an object of mass 60.0kg in the moon's gravitational field is 1.002 x 10²N. What is the intensity of the gravitational field?

A0.60Nkg^-1

B1.67Nkg^-1

C6.12 x 10²Nkg^-1

D9.81ms^-2

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Question 896

jamb 1993

A rocket burns fuel at the rate of 10kgs^-1 and ejects it with velocity of 5 x 10³ms^-1. The thrust exerted by the gas on the rock is

A2.5 x 10⁷N

B5.0 x 10⁴N

C5.0 x 10²N

D2.0 x 10^-3N

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Question 897

jamb 1993

Two forces of magnitudes 7N and 3N act at right angles to each other. The angle \(\theta\) between the resultant and the 7N force is given by

Acos\(\theta\) = \(\frac{3}{7}\)

Bsin\(\theta\) = \(\frac{3}{7}\)

Ctan\(\theta\) = \(\frac{3}{7}\)

Dcot\(\theta\) = \(\frac{3}{7}\)

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Question 898

jamb 1993

The external and internal diameter of a tube are measured as (32 ± 2)mm and (21 ± 1)mm respectively. Determine the percentage error in the thickness of the tube.

A27%

B14%

C9%

D3%

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Question 899

jamb 1993

Which of the following quantities has the same unit as the watt?

AForce x time

BForce x distance

CForce x acceleration

DForce x velocity

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Question 900

jamb 1992

PQRS is rectangular cell with PQ perpendicular to the magnetic field as shown above. If a current flows in the the direction PQRS in what direction will the coil move

AUpwards

BDownwards

CTOwards The North Pole

DTowards The South Pole

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