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2,483 questions

Question 1 of 20 2,483 total questions

Question 841

jamb 1995

The volume of an air bubble increases from the bottom to the top of a lake at constant temperature because

Aatmospheric pressure acts on the surface of the lake

Bpressure increases with depth

Cdensity remains constant with pressure

Dthe bubble experiences an upthrust

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Question 842

jamb 1995

A hydraulic press has a large circular piston of radius 0.8m and a circular plunger of radius 0.2m. A force of 500N is exerted by the plunger. Find the force exerted on the piston

A8000N

B4000N

C2000N

D31N

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Question 843

jamb 1995

The energy contained in a wire when it extended by 0.02m by a force 500 N is

A5J

B10J

C10³J

D10⁴

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Question 844

jamb 1995

Which of the following statements are TRUE about frictional force? i. it is always a disadvantage ii. it is sometimes a disadvantage iii. it always exist where there is a relative motion of two bodies that are in contact iv. it is sometimes very useful

Ai, iii only

Bi, iv only

Cii, iii only

Diii, iv only

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Question 845

jamb 1995

A vehicle of mass m is driven by an engine of power P from rest. Find the minimum time it will take to acquire a speed

A\(\frac{mv^2}{2p}\)

B\(\frac{mv^2}{p}\)

C\(\frac{mv}{p}\)

D\(\frac{mv}{2p}\)

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Question 846

jamb 1995

A uniform rod PQ of length 1m and mass 2kg is pivoted at the end p. If load of 14N is placed at the center of the rod, find the force that should be applied vertically upwards at Q to maintain the rod at equilibrium horizontally [g = 10ms^-2]

A68N

B28N

C17N

D7N

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Question 847

jamb 1995

A body is projected from the earth's surface with the intention of letting it escape from the earth's gravitational field. What is the minimum escape velocity of the body? [Earth's radius = 6.4 x 10³km, g = 10ms^-2]

A14 kms^-1

B13 kms^-1

C12 kms^-1

D11 kms^-1

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Question 848

jamb 1995

What is the acceleration due to gravity 'g' on the moon, if g is 10^-2 on the earth?

A0. 10 ms^-2

B0.74ms^-2

C1.6ms^-2

D10.00ms^-2

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Question 849

jamb 1995

When a ball rolls on a smooth level ground, the motion of its center is

Atranslational

Boscillatory

Crandom

Drotational

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Question 850

jamb 1995

The length of a displaced pendulum ball which passes its lowest point twice every seconds is [g = 10ms-2]

A0.25 m

B0.45 m

C0.58m

D1.00m

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Question 851

jamb 1995

Which of the following is the dimension of pressure?

AML^-1T^-2

BMLT^-2

CML²T^-3

DML^-3

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Question 852

jamb 1994

In the curve above, PQRST represents an alternating voltage of frequency 50Hz. The time interval between points P and R on the graph is

A25s

B1/50s

C1/100s

D1/200s

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Question 853

jamb 1994

In the circuit diagram above, calculate the current in the 12 Ω resistor if the cell has an emf of 12V and an internal resistance of 1Ω

A0.8A

B1.0A

C1.6A

D2.4A

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Question 854

jamb 1994

In the fig above, XY is of length 1m, The value of R at balance point Z is

A3.0Ω

B13.3Ω

C15.0Ω

D30.0Ω

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Question 855

jamb 1994

In the fig above if the atmospheric pressure is 760mm, the pressure of the chamber G is

A660mm

B690mm

C830mm

D860mm

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Question 856

jamb 1994

The fig above shows a uniform wood of weight 200Nand length 50m. It is pivoted at one end and suspended by a cord at the other end at an angle of 30 degrees to the wood. calculate the tension in the cord if the wood is horizontal

A10N

B20N

C100N

D200N

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Question 857

jamb 1994

What is the reading of the vernier calipers shown above

A1.79cm

B1.73cm

C1.39cm

D1.34cm

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Question 858

jamb 1994

A spring of length 25cm is extended to 30cm by a load of 150N attached to one of its end, what is the energy stored in the spring?

A3750J

B2500J

C3.75J

D2.50J

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Question 859

jamb 1994

If light with photon energy 2eV is incident suitably on the surface of a metal with work function 3eV, then

Ano electron will be emitted

Bthe few electrons emitted will have a maximum kinetic energy of 1eV

Cthe few electrons emitted will have a maximum kinetic energy of 3eV

Dmany electrons will be emitted

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Question 860

jamb 1994

A certain radioisotope of \(^{235}_{92}U\) emits four alpha particles and three beta particles. The mass number and the atomic number of the resulting elements respectively are

A219 and 87

B84 and 223

C223 and 87

D219 and 81

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