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2,483 questions

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Question 791

jamb 1998

A platinum resistance thermometer records 3.0\(\Omega\) at 0^oC and 8.0\(\Omega\) at 100^oC. If it records 6.0\(\Omega\) in a certain environment, The temperature of the medium is

A80^oC

B60^oC

C50^oC

D30^oC

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Question 792

jamb 1998

A solid of weight 0.600N is totally immersed in oil and water respectively. If the upthrust of oil is 0.210N and the relative density of oil is 0.875. Find the upthrust in water.

A0.600N

B0.360N

C0.240N

D0.180N

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Question 793

jamb 1998

The atmospheric pressure due to water is 1.3 x 10⁶Nm^-2. What is the total pressure at the bottom of an ocean 10m deep? [Density of water = 1000kgm^-3, g = 10ms^-2]

A1.3 x 10⁷Nm^-2

B1.4 x 10⁶Nm^-2

C1.4 x 10⁵Nm^-2

D1.0 x 10 ⁵Nm^-2

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Question 794

jamb 1998

Which of these statements are correct for the pressures in liquids? i. pressure in a liquid at a point acts equally in all directions. ii. pressure increases with depth. iii. pressure at a depth depends on the shape of the container. iv. pressure at the same depth in different liquids are proportional to the density at different liquids.

Ai, ii, iii only

Bi, ii, iv only

Ci, iii, iv only

Dii, iii, iv only

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Question 795

jamb 1998

The tendon in a man's leg is 0.01m long. If a force of 5N stretches the tendon by 2.0 x 10^-5m, calculate the strain on the muscle.

A5 x 10⁶

B5 x 10²

C2 x 10^-3

D2 x 10^-7

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Question 796

jamb 1998

In a wheel and axle mechanism the diameters of the wheel and axle are 40cm and 8cm respectively. Given that the machine is 80% efficient, what effort is required to lift a load of 100N?

A20N

B25N

C50N

D80N

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Question 797

jamb 1998

A parachute attains a terminal velocity when

Aits density is equal to the density of air

Bthe viscous force of the air and the upthrust completely counteract its weight

Cit expands as a result of reduced external pressure

Dthe viscous force of the air is equal to the sum of the weight and upthrust

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Question 798

jamb 1998

A man whose mass is 80kg climbs a staircase in 20s and expends power of 120W. Find the height of the staircase.[g = 10ms^-2]

A1.8m

B2.0m

C2.5m

D3.0m

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Question 799

jamb 1998

A uniform meter rule weighing 0.5N is to be pivoted on a knife-edge at the 30cm-mark. where will a force of 2N be placed from the pivot to balance the meter rule?

A95cm

B25cm

C20cm

D5cm

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Question 800

jamb 1998

The force of attraction between two point masses is 10^-4N when the distance between them is 0.18m. If the distance is reduced to 0.06m, calculate the force.

A1.1 x 10^-5N

B3.3 x 10^-5N

C3.0 x 10^-4N

D9.0 x 10^-4N

View Explanation & Discuss

Question 801

jamb 1998

A ball of mass 0.15kg is kicked against a rigid vertical wall with a horizontal velocity of 50ms-1. If it rebounced with a horizontal velocity of 30ms-1, Calculate the impulse of the ball on the ball · ·

A3.0Ns

B4.5Ns

C7.5Ns

D12.0Ns

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Question 802

jamb 1998

In free fall, a body of mass 1kg drops from a height of 125m from rest in 5s. How long will it take another body of mass 2kg to fall from rest from the same height? [g = 10ms^-1·]

A5s

B10s

C12s

D15s

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Question 803

jamb 1998

A ball is moving at 18ms\(^{-1}\) in a direction inclined at 60º to the horizontal. The horizontal component to its velocity is

A9√3ms^-1 ·

B6√3ms^-1 ·

C8√3ms^-1 ·

D9ms^-1 ·

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Question 804

jamb 1998

The physical quantity that has the same dimensions as impulse is

Aenergy

Bmomentum

Csurface tension

Dpressure

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Question 805

jamb 1998

The velocity of a sound wave at 27oC is 360ms-1. Its velocity at 127oC is

A120√3 ms^-1

B240 ms^-1

C240√3 ms^-1

D720√3 ms^-1

View Explanation & Discuss

Question 806

jamb 1998

A bullet fired at a wooden block of thickness 0.15m manages to penetrate the block. If the mass of the bullet is 0.025kg and the average resisting force of the wood is 7.5 x 10³N, calculate the speed of the bullet just before it hits the wooden block.

A450ms^-1

B400ms^-1

C300ms^-1

D250ms^-1

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Question 807

jamb 1997

In the diagram above, which of the angles \( \theta _1 \) , \( \theta _2 \) , \( \theta _3 \) and \( \theta _4 \) is the angle of deviation of the ray of light passing through the glass prism XYZ?

A\( \theta _3 \)

B\( \theta _2 \)

C\( \theta _1 \)

D\( \theta _4 \)

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Question 808

jamb 1997

When the sun, moon and the earth are as shown in the diagram above an observer standing in X is in

APenumbra and sees a partial eclipse

BPenumbra and sees a total eclipse

Cumbra and sees a partial eclipse

Dumbra and sees a total eclipse

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Question 809

jamb 1997

The diagram above shows two wave forms P and Q at a particular instant in time. the two waves will interface

Adestructively to produce a wave of larger amplitude

Bdestructively to produce a wave of smaller amplitude

Cconstructively to produce a wave of larger amplitude

Dconstructively to produce a wave of smaller amplitude

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Question 810

jamb 1997

For a rough inclined plane on which lies a body of weight W, the angle θ in the diagram above becomes the angle of friction if

Atan θ = coefficient of static friction

Bcos θ = coefficient of dynamic friction

Csin θ = coefficient of sliding friction

Dsec θ = limiting frictional force

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