JAMB Physics questions

450 questions with answers and explanations. Tap an option to check yourself.

All JAMB WAEC

Question 341· Quantity of heat· JAMB
The method of mixtures assumes that
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Answer: A. heat lost by hot bodies equals heat gained by cold bodies
Explanation and discussion
Question 342· Quantity of heat· JAMB
A 1 kW heater warms 2 kg of water for 7 minutes with no heat losses. Find the rise in temperature. (c = 4200 J/(kg K))
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Answer: C. 50 K
Explanation and discussion
Question 343· Quantity of heat· JAMB
How much heat is needed to raise the temperature of 500 g of water by 20 K? (c = 4200 J/(kg K))
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Answer: C. 42 000 J
Explanation and discussion
Question 344· Quantity of heat· JAMB
Water is used in car radiators mainly because it has a
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Answer: C. high specific heat capacity
Explanation and discussion
Question 345· Quantity of heat· JAMB
0.5 kg of water at 80 °C is mixed with 0.5 kg of water at 20 °C. Find the final temperature, ignoring heat losses.
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Answer: D. 50 °C
Explanation and discussion
Question 346· Quantity of heat· JAMB
A 200 g piece of metal at 100 °C is dropped into 100 g of water at 20 °C. The final temperature is 30 °C. Find the specific heat capacity of the metal, ignoring heat losses. (c of water = 4200 J/(kg K))
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Answer: D. 300 J/(kg K)
Explanation and discussion
Question 347· Quantity of heat· JAMB
A 0.2 kg metal at 100 °C is put into 0.5 kg of water at 20 °C, and the final temperature is 25 °C. Find the specific heat capacity of the metal. [c of water = 4200 J/kg K]
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Answer: B. 700 J/kg K
Explanation and discussion
Question 348· Scalars and vectors· JAMB
Forces of 5 N due east and 12 N due north act on a body. Find the magnitude of their resultant.
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Answer: C. 13 N
Explanation and discussion
Question 349· Scalars and vectors· JAMB
A ball is thrown at 20 m/s at 30° above the horizontal. Find the vertical component of its velocity.
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Answer: C. 10 m/s
Explanation and discussion
Question 350· Scalars and vectors· JAMB
Which pair consists of vector quantities only?
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Answer: A. velocity and acceleration
Explanation and discussion
Question 351· Scalars and vectors· JAMB
Two forces of 3 N and 4 N act on a body. Which of the following CANNOT be their resultant?
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Answer: D. 8 N
Explanation and discussion
Question 352· Scalars and vectors· JAMB
Two forces, each of 7 N, act at a point with an angle of 120° between them. Find the magnitude of their resultant.
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Answer: B. 7 N
Explanation and discussion
Question 353· Scalars and vectors· JAMB
A boat is steered straight across a river at 4 m/s while the current flows at 3 m/s. Find the resultant speed of the boat.
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Answer: C. 5 m/s
Explanation and discussion
Question 354· Scalars and vectors· JAMB
Two forces of 6 N and 8 N act at right angles at a point. Their resultant is:
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Answer: A. 10 N
Explanation and discussion
Question 355· Scalars and vectors· JAMB
Which of the following is a scalar quantity?
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Answer: A. mass
Explanation and discussion
Question 356· Scalars and vectors· JAMB
Forces of 5 N and 12 N act on a body. Which of these cannot be their resultant?
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Answer: D. 18 N
Explanation and discussion
Question 357· Scalars and vectors· JAMB
A boat heads straight across a river at 4 m/s while the current flows at 3 m/s. Find its resultant speed.
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Answer: B. 5 m/s
Explanation and discussion
Question 358· Scalars and vectors· JAMB
Two forces of 6 N and 8 N act at right angles on a body. The force that would keep the body in equilibrium is
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Answer: A. 10 N acting opposite to the resultant
Explanation and discussion
Question 359· Scalars and vectors· JAMB
Find the vertical component of a 50 N force inclined at 30° to the horizontal.
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Answer: A. 25 N
Explanation and discussion
Question 360· Scalars and vectors· JAMB
A force of 10 N acts at 60° to the horizontal. Find its horizontal component.
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Answer: D. 5 N
Explanation and discussion

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JAMB Physics questions

The method of mixtures assumes that

A 1 kW heater warms 2 kg of water for 7 minutes with no heat losses. Find the rise in temperature. (c = 4200 J/(kg K))

How much heat is needed to raise the temperature of 500 g of water by 20 K? (c = 4200 J/(kg K))

Water is used in car radiators mainly because it has a

0.5 kg of water at 80 °C is mixed with 0.5 kg of water at 20 °C. Find the final temperature, ignoring heat losses.

A 200 g piece of metal at 100 °C is dropped into 100 g of water at 20 °C. The final temperature is 30 °C. Find the specific heat capacity of the metal, ignoring heat losses. (c of water = 4200 J/(kg K))

A 0.2 kg metal at 100 °C is put into 0.5 kg of water at 20 °C, and the final temperature is 25 °C. Find the specific heat capacity of the metal. [c of water = 4200 J/kg K]

Forces of 5 N due east and 12 N due north act on a body. Find the magnitude of their resultant.

A ball is thrown at 20 m/s at 30° above the horizontal. Find the vertical component of its velocity.

Which pair consists of vector quantities only?

Two forces of 3 N and 4 N act on a body. Which of the following CANNOT be their resultant?

Two forces, each of 7 N, act at a point with an angle of 120° between them. Find the magnitude of their resultant.

A boat is steered straight across a river at 4 m/s while the current flows at 3 m/s. Find the resultant speed of the boat.

Two forces of 6 N and 8 N act at right angles at a point. Their resultant is:

Which of the following is a scalar quantity?

Forces of 5 N and 12 N act on a body. Which of these cannot be their resultant?

A boat heads straight across a river at 4 m/s while the current flows at 3 m/s. Find its resultant speed.

Two forces of 6 N and 8 N act at right angles on a body. The force that would keep the body in equilibrium is

Find the vertical component of a 50 N force inclined at 30° to the horizontal.

A force of 10 N acts at 60° to the horizontal. Find its horizontal component.