Which of the following does NOT describe the Image formed by a plane minor?

Same distance from mirror as object

A positively charged rod X is brought near an uncharged metal sphere Y and is then touched by a finger with X still in place. When the finger is removed, the result is that Y has

a negative charge and a negative potential

a positive charge and a zero potential

a negative charge and a positive potential

a negative charge and a negative potential

Temperature is the property of a body which is proportional to the ____.

average kinetic energy of its molecules

total kinetic energy of its molecules

average kinetic energy of its molecules

A narrow beam of white light can be split up into different colours by a glass prism. The correct explanation is that

different colours of white light travel with different speeds in glass

white light Is an electromagnetic wave

the prism has all the colours of the white light

different colours of white light travel with different speeds in glass

white light has undergone total Internal reflection in the prism

Convex mirrors are used as driving mirrors because images formed are

inverted, virtual and diminished

Electrical appliances in homes are normally earthed so that

a person touching the appliances is safe from electric shock

both the a.c. and d.c. sources can be used

the appliances are maintained at a higher pd than the earth

the appliances are maintained at a lower pd than the earth

Natural radioactivity consists of the emission of

α- particles, β - rays and g-rays

High-energy electromagnetic waves

JAMB UTME - Physics - 2018 | Green Bridge CBT

Question 1 Report

A 20kg mass is to be pulled up a slope inclined at 300 to the horizontal. If efficiency of the plane is 75%. The force required to pull the load up the plane is J [g=10ms$^{-2}$]

87N

73.5N

133.3N

533.2N

Answer Details

The force required to pull a 20kg mass up a slope inclined at 300 can be calculated using the formula: force = mass * gravity * sin(angle) where mass is 20kg, gravity is 10 m/s^2 and angle is 300. The formula for efficiency is: efficiency = output force / input force where output force is the force required to pull the mass up the slope and input force is the force applied to the rope. Since the efficiency of the plane is 75%, the input force is 4 times the output force. So, the output force can be calculated as: output force = input force / 4 input force = mass * gravity * sin(angle) / efficiency input force = 20 * 10 * sin(300) / 0.75 input force = 533.2 N And the output force can be calculated as: output force = input force / 4 output force = 533.2 / 4 output force = 133.3 N So, the force required to pull the load up the plane is 133.3 N.






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