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$A boy observes a piece of stone at the bottom of a river 6.0m deep. If he looks from the surface of the river. What is the apparent distance of the stone from him? [Refractive Index of Water = 4/3]$

A boy observes a piece of stone at the bottom of a river 6.0m deep. If he looks from the surface of the river. What is the apparent distance of the stone from him? [Refractive Index of Water = 4/3]

by Sunday | Nov 16 | Physics JAMB

A. 8.0m B. 5.5m C. 5.0m D. 4.5m Correct Answer: Option D = 4.5m Explanation Refractive Index = Real Depth/App. Depth 4/3 = 6/app. depth App Depth = (3 x 6)/4 = 4.5m

Which of the conditions below are necessary to produce interference fringes?

by Sunday | Nov 16 | Physics JAMB

I. Coherence II. Same frequency III. Same wavelength IV. Same Intensity A. I and III B. I, II and IV C. I, II and III D. II and III Correct Answer: Option C – I, II and III

$A boy observes a piece of stone at the bottom of a river 6.0m deep. If he looks from the surface of the river. What is the apparent distance of the stone from him? [Refractive Index of Water = 4/3]$

A quantity of water at 0°C is heated to about 30°C. At each degree rise in temperature, its density will?

by Sunday | Nov 16 | Physics JAMB

A. rise steadily B. fall steadily C. fall then rise D. rise then fall Correct Answer: Option D – rise then fall

$A boy observes a piece of stone at the bottom of a river 6.0m deep. If he looks from the surface of the river. What is the apparent distance of the stone from him? [Refractive Index of Water = 4/3]$

Total internal reflection occurs when light moves from?

by Sunday | Nov 16 | Physics JAMB

A. a dense medium to a less dense medium B. air to water C. water to glass D. a less dense to a dense medium Correct Answer: Option A – a dense medium to a less dense medium

$A boy observes a piece of stone at the bottom of a river 6.0m deep. If he looks from the surface of the river. What is the apparent distance of the stone from him? [Refractive Index of Water = 4/3]$

Which combination of the above is true of sliding friction?

by Sunday | Nov 16 | Physics JAMB

I. The frictional force is independent of the area of the surfaces in conduct II. The frictional force depends on the nature of the surfaces in contact III. The frictional force depends on the speed of sliding IV. The frictional force is directly proportional to the...

A rope is being used to pull a mass of 10kg vertically upward. Determine the tension in the rope if starting from rest; the mass acquires a velocity of 4ms‾¹ in 8s [g = 10ms−²2]

by Sunday | Nov 16 | Physics JAMB

A. 5N B. 50N C. 95N D. 105N Correct Answer: Option D – 105N Explanation Tension = Force of gravity + acceleration force = mg + ma a=v−u/t = 4−0/8 = 0.5 ms−² Tension = 10×10+10×0.5 = 100 + 5 =...

$A boy observes a piece of stone at the bottom of a river 6.0m deep. If he looks from the surface of the river. What is the apparent distance of the stone from him? [Refractive Index of Water = 4/3]$

A stream is flowing at 0.75ms‾¹ and a boat heading perpendicular for the stream landed at the opposite bank at an angle of 30°. Calculate the velocity of the boat.

by Sunday | Nov 16 | Physics JAMB

A. 1.50ms‾¹ B. 1.00ms‾¹ C. 0.86ms‾¹ D. 0.65ms‾¹ Correct Answer: Option C – 0.86ms‾¹ Explanation Let the velocity of the boat = Vm/s 0.75/V = adj/hyp = Cos 30° 0.75/V = 0.8660 ∴ V = 0.75/0.8660 V = 0.866...

$A boy observes a piece of stone at the bottom of a river 6.0m deep. If he looks from the surface of the river. What is the apparent distance of the stone from him? [Refractive Index of Water = 4/3]$

A catapult used to hold a stone of mass 500g is extended by 20cm with an applied force F. If the stone leaves with a velocity of 40m/s, the value of F is?

by Sunday | Nov 16 | Physics JAMB

A. 4.0 x 102N B. 2.0 x 103N C. 4.0 x 103N D. 4.0 x 104N Correct Answer: Option C = 4.0 x 103N Explanation Work done = kinetic energy of the stone ½Fe= ½mv² Given m = 500g = 0.5kg; v = 40m/s ; e = 20cm = 0.2m F=mv²/e = 0.5×(40)²/0.2 = 4.0 × 103...

$A boy observes a piece of stone at the bottom of a river 6.0m deep. If he looks from the surface of the river. What is the apparent distance of the stone from him? [Refractive Index of Water = 4/3]$

What is the angle of dip at the magnetic equator?

by Sunday | Nov 15 | Physics JAMB

A. 45° B. 0° C. 90° D. 180° Correct Answer: Option B = 0° Explanation The angle of dip is the angle which the resultant earth’s magnetic field makes with the horizontal. At the magnetic equator, which is entirely along the horizontal this angle is...

$A boy observes a piece of stone at the bottom of a river 6.0m deep. If he looks from the surface of the river. What is the apparent distance of the stone from him? [Refractive Index of Water = 4/3]$

A bread toaster uses a current of 4A when plugged in a 240V line. it takes 1 minute to toast slices of bread. what is the energy consumed by the toaster?

by Sunday | Nov 15 | Physics JAMB

A. 5.76 x 104J B. 1.60 x 104J C. 3.60 x 103J D. 1.60 x 102J Correct Answer: Option A – 5.76 x 104J Explanation Electrical Energy = IVt = 4 x 240 x (1 x 60) = 57600J = 5.76 x 104J

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A boy observes a piece of stone at the bottom of a river 6.0m deep. If he looks from the surface of the river. What is the apparent distance of the stone from him? [Refractive Index of Water = 4/3]

Which of the conditions below are necessary to produce interference fringes?

A quantity of water at 0°C is heated to about 30°C. At each degree rise in temperature, its density will?

Total internal reflection occurs when light moves from?

Which combination of the above is true of sliding friction?

A rope is being used to pull a mass of 10kg vertically upward. Determine the tension in the rope if starting from rest; the mass acquires a velocity of 4ms‾¹ in 8s [g = 10ms−²2]

A stream is flowing at 0.75ms‾¹ and a boat heading perpendicular for the stream landed at the opposite bank at an angle of 30°. Calculate the velocity of the boat.

A catapult used to hold a stone of mass 500g is extended by 20cm with an applied force F. If the stone leaves with a velocity of 40m/s, the value of F is?

What is the angle of dip at the magnetic equator?

A bread toaster uses a current of 4A when plugged in a 240V line. it takes 1 minute to toast slices of bread. what is the energy consumed by the toaster?

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