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4,719 questions

Question 1 of 20 4,719 total questions

Question 2121

jamb 1988

A force, 10N, drags a mass 10kg on a horizontal table with an acceleration of 0.2ms. If the acceleration due to gravity is 10ms-1, the coefficient of friction between the moving mass and the table is

A0.02

B0.08

C0.20

D0.80

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Question 2122

jamb 1988

How long will it take a 60kg man to climb a height of 22m if he expended energy at a rate of 0.25kW. [g = ms^-2]

A5.3s

B34.5s

C41.6s

D52.8s

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Question 2123

jamb 1988

A 20-toothed gear wheel drives a 60-toothed one. If the angular speed of the smaller wheel is 120 rev s^-1, the angular speed of the larger wheel is

A3 rev s^-1

B40 rev s^-1

C360 rev s^-1

D2400 rev s^-1

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Question 2124

jamb 1988

A particle starts from rest and moves with a constant acceleration of 0.5ms\(^{-2}\). The distance covered by the particle in 10s is?

A2.5m

B5.0m

C25.0m

D50.0m

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Question 2125

jamb 1988

When taking a penalty kick, a footballer applies a force of 30.0N for a period of 0.05s. if the mass of the ball is 0.075kg, calculate the speed with which the ball moves off.

A4.50ms^-1

B11.25ms^-1

C20.00ms^-1

D45.00ms^-1

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Question 2126

jamb 1988

Which of the following quantities are scalars? i. Electrical potential ii. Torque iii. Momentum iv. Kinetic energy

Aii and iii only

Bi and ii only

Ciii and iv only

Di and iv only

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Question 2127

jamb 1988

Two forces whose resultant is 100N, are at right angle to each other. If one of them makes an angle 30^o with the resultant, determine its magnitude.

A8.66N

B50.0N

C57.7N

D86.6N

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Question 2128

jamb 1988

A lorry travels 10km northwards, 4km eastwards, 6km southwards, 4km westwards to arrive at a point T. What is the total displacement?

A6km south

B4km north

C6km north

D4km east

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Question 2129

jamb 1988

Which of the following are the correct SI units of the quantities indicated? i.N(Force) II. N/m (Torque) iii. watt(Power) iv. kgms-2(Momentum)

Ai and ii only

Bi, ii and iii only

Ci, ii, and iv only

Di and iii only

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Question 2130

jamb 1987

In the fig above, M and N are insulated metal spheres in contact. A negatively charged ebonite rod P is I brought near M. When M and N are Separated and the rod is taken away, which of the following statements is correct

Aboth M and N have acquired negative charges

Bboth M and N have acquired positive charges

CM has acquired negative charge and N positive charge

DN has acquired negative charge and M positive charge

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Question 2131

jamb 1987

In the above, a voltage V is applied across the terminals P and Q. The voltage across the 1 ohm resistor is

AV/8

BV/4

CV/3

DV/2

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Question 2132

jamb 1987

fig above represents the main sequence of energy conversion at kainji dam. what is the efficiency of the system?

A\(\frac{Q_1}{Q_2}\)

B\(\frac{E}{Q_1}\)

C\(\frac{E}{Q_1 - Q_2}\)

D\(\frac{E}{Q_1 + Q_2}\)

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Question 2133

jamb 1987

A 50kg block is dropped from a point 10m above, as shown in the figure above. if the force constant of the spring is 4.0 x 10\(^4\)Nm-1, find the maximum compression of the spring. [g = 10ms\(^{-2}\)]

A1.25m

B0.50m

C0.25m

D0.05m

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Question 2134

jamb 1987

the fig above shows two connected bodies of masses M\(_1\) and M\(_2\) in equilibrium under gravity. The tension in the upper string is

A(m\(_1\)-m\(_2\))g

Bm\(_1\)g

Cm\(_2\)g

D(m\(_1\)+m\(_2\))g

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Question 2135

jamb 1987

The velocity time graph above describes the motion of a particle between two points P and Q. What is the distance between P and Q?

A17.0m

B18.0m

C22.5m

D30.0m

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Question 2136

jamb 1987

A radioactive sample initially contains N atoms. After three half-lives the number of atoms that have disintegrated is

A\(\frac{N}{8}\)

B\(\frac{3N}{8}\)

C\(\frac{5N}{8}\)

D\(\frac{7N}{8}\)

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Question 2137

jamb 1987

Isotopes are nuclei which have

Athe same number of nuetrons and electrons

Bequal number of electrons and protons

Cthe same atomic number but different number of neutrons

Dthe same number of total particles

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Question 2138

jamb 1987

Which of the following statements is TRUE of photoelectric effect?

Ait cannot occur in liquids

Bthe energy of the emitted electrons is independent of the work function of the surface

Cthe energy of the emitted electron depends on the wavelength of the incident light

Dthe greater the intensity of the incuident light, the greater the incident of the emitted electron

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Question 2139

jamb 1987

What type of reaction is represented by the following scheme? \( ^2 _1X \) + \( ^{2} _{1}Y \) + \( ^{3} _{2}Z \) + \( ^{1} _{0}n \) + energy

AFusion reaction

BFission reaction

CChain reaction

DRadioactive decay

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Question 2140

jamb 1987

A galvanometer of resistance 20\(\Omega\) is to be provided with a shunt that \(\frac{1}{10}\) of the whole current in a circuit passes through the galvanometer. The resistance of the shunt is

A2.00\(\Omega\)

B2.22\(\Omega\)

C18.00\(\Omega\)

D18.22\(\Omega\)

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