JAMB and WAEC Physics questions

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

All JAMB WAEC

Question 621· Quantity of heat· WAEC
Water is used as a coolant in car radiators because it has a
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Answer: B. high specific heat capacity
Explanation and discussion
Question 622· Quantity of heat· JAMB
The method of mixtures for finding specific heat capacity is based on the principle that
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Answer: C. heat lost by the hot body equals heat gained by the cold body
Explanation and discussion
Question 623· Quantity of heat· JAMB
Find the heat capacity of a 2 kg block with specific heat capacity 400 J/(kg K).
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Answer: A. 800 J/K
Explanation and discussion
Question 624· Quantity of heat· WAEC
The quantity of heat needed to raise the temperature of a whole body by 1 K is its
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Answer: B. heat capacity
Explanation and discussion
Question 625· 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 626· Quantity of heat· WAEC
200 g of water at 80 °C is mixed with 300 g of water at 30 °C. Find the final temperature if no heat is lost.
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Answer: C. 50 °C
Explanation and discussion
Question 627· Quantity of heat· WAEC
Find the heat capacity of a 0.5 kg block whose specific heat capacity is 900 J/kg K.
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Answer: A. 450 J/K
Explanation and discussion
Question 628· 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 629· Quantity of heat· WAEC
How much heat is needed to raise the temperature of 2 kg of water by 10 °C? (specific heat capacity of water = 4,200 J/kg K)
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Answer: C. 84,000 J
Explanation and discussion
Question 630· 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 631· Quantity of heat· WAEC
Find the heat needed to raise the temperature of 0.5 kg of copper by 40 °C. (c = 400 J/kg K)
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Answer: A. 8,000 J
Explanation and discussion
Question 632· 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 633· 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 634· 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 635· 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 636· Scalars and vectors· WAEC
Which pair consists of a scalar and a vector respectively?
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Answer: D. speed and acceleration
Explanation and discussion
Question 637· Scalars and vectors· WAEC
Which of these quantities has both size and direction?
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Answer: C. weight
Explanation and discussion
Question 638· 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 639· Scalars and vectors· WAEC
A force of 20 N acts at 60° to the horizontal. What is its horizontal component?
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Answer: B. 10 N
Explanation and discussion
Question 640· 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

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JAMB and WAEC Physics questions

Water is used as a coolant in car radiators because it has a

The method of mixtures for finding specific heat capacity is based on the principle that

Find the heat capacity of a 2 kg block with specific heat capacity 400 J/(kg K).

The quantity of heat needed to raise the temperature of a whole body by 1 K is its

The method of mixtures assumes that

200 g of water at 80 °C is mixed with 300 g of water at 30 °C. Find the final temperature if no heat is lost.

Find the heat capacity of a 0.5 kg block whose specific heat capacity is 900 J/kg K.

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 2 kg of water by 10 °C? (specific heat capacity of water = 4,200 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))

Find the heat needed to raise the temperature of 0.5 kg of copper by 40 °C. (c = 400 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]

Which pair consists of a scalar and a vector respectively?

Which of these quantities has both size and direction?

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

A force of 20 N acts at 60° to the horizontal. What is its horizontal component?

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