physics

An immersion heater is rated 120W. How long does it take the heater to raise the temperature of 1.2kg of water by 15°C. (Assuming heat lost to the surrounding is negligible. Specific heat capacity of water = 4200 Jkg‾¹K‾¹C)

A. 65.0 minutes B. 60.0 minutes C. 52.5 minutes D. 10.5 minutes Correct Answer: Option D C. 52.5 minutes

6 years ago

In the diagram given, the current passing through the 6Ω resistor is 1.5A. Calculate the terminal p.d. of the battery in the diagram

A. 7.50V B. 9.00V C. 10.80V D. 1.25V Correct Answer: Option C C. 10.80V Explanation C.V = 1R1 + 1R2…

6 years ago

In the diagram below, the current passing through the 6Ω resistor is 1.5A. Calculate the current in the 30Ω resistor

A. 1.20A B. 0.90A C. 0.75A D. 0.60A Correct Answer: Option D D. 0.60A

6 years ago

The capacitance of a parallel-plate capacitor is increased by making the area of the plates?

A. small and their separation large B. large and their separation small C. and their separation small D. and their…

6 years ago

An object is situated within the Earth’s gravitational field. Which of the following factor does not affect the acceleration of free fall g?

A. the distance of the object from the centre of the earth B. the latitude of the earth on which…

6 years ago

The factor which enables the ear to distinguish between a note played on different instruments is the?

A. pitch B. speed C. harmonics D. loudness Correct Answer: Option A A. pitch

6 years ago

Loudness increases as a vibrating tuning fork is brought nearer the end of a pipe containing air column due to?

A. resonance B. echo C. reverberation D. diffraction Correct Answer: Option A A. resonance

6 years ago

A tuning fork of frequency 600Hz is sounded over a closed resonance tube. If the first and second resonant positions are 0.130m and 0.413m respectively, calculate the speed of sound in air.

A. 508.4ms‾¹ B. 480.0ms‾¹ C. 339.6ms‾¹ D. 169.8ms‾¹ Correct Answer: Option C C. 339.6ms‾¹ Explanation v=fλ v=2f×(l2−l1) v=2×600×(0.413−0.130) v=1200×0.283 v=339.6ms‾¹

6 years ago

In which of the following media does sound travel faster?

A. water B. brass C. air D. wood Correct Answer: Option B B. brass

6 years ago

When white light passes through a triangular glass prism, there is dispersion because of?

A. diffraction of light B. polarisation of light C. the difference in speed of the components of light D. the…

6 years ago
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