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JAMB Physics Past Questions & Answers - Page 211

1,051.

The combination of sound waves with different frequencies is known as

interference

diffraction

superposition

forced vibration

resonance

View answer & explanation

Correct answer is C

No explanation has been provided for this answer.

1,052.

An object 15cm high is 30cm from pin-hole camera. If the height of the image formed at the back of the camera is 10cm, the image distance is

20cm

45cm

54cm

63cm

70cm

View answer & explanation

Correct answer is A

$\frac{\text{image height}}{\text{object height}}$ = $\frac{\text{image distance}}{\text{object distance}}$

$\frac{10}{15}$ = $\frac{\text{image distance}}{30}$

image distance = 20cm

1,053.

250g of lead at 170^oC is dropped into 100g of water at 0^oC. If the final temperature is 12^oC, the specific heat of lead is (specific heat of water is 4,200J/kg^oC)

39.5J/kg^oC

50.4J/kg^oC

127.6J/kg^oC

154.6J/kg^oC

173.4J/kg^oC

View answer & explanation

Correct answer is C

Heat lost = heat gained

0.25 x C₁ x (170 - 12) = 0.1 x 4200 x (12 - 0)

C₁ = 127.6J/kg^oC

1,054.

Which of the following statements is NOT true? Thermostats are used to control the temperature of

pressure cookers

laundry irons

hot water storage tanks

aquaria for tropical fish

heated apartments

View answer & explanation

Correct answer is A

No explanation has been provided for this answer.

1,055.

The accurate measurement of the relative density of substances in powder or granular form can be done using a beam balance and a

pipette

burette

measuring cylinder

density

bottle

View answer & explanation

Correct answer is E

No explanation has been provided for this answer.

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