Recent questions in Physics

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An air bubble with a volume of 1 cm3 escapes from the helmet of a diver at a depth of 200 m below the water surface. What will be the volume of the bubble immediately it breaks the surface of water? (Take atmospheric pressure = 10 m of water)

asked Jul 7, 2021 in Physics Form 1 by anonymous

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2 answers

State the principle of moments

asked Jul 7, 2021 in Physics Form 2 by anonymous

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A railway truck of mass 4000 kg moving at 3 m/s collides with a stationary truck of mass 2000 kg. The couplings join and the trucks move off together. Calculate their common velocity after collision.

asked Jul 7, 2021 in Physics Form 3 by anonymous

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Give a reason why heat transfer by radiation is faster than heat transfer by conduction

asked Jul 7, 2021 in Physics Form 1 by anonymous

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1 answer

State the SI unit of density

asked Jul 7, 2021 in Physics Form 1 by anonymous

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Calculate the temperature change of water as it falls through a height of 20 m. (Take g = 10 N/kg and s.h.c of water =4200 J/kg/K)

asked Jul 7, 2021 in Physics Form 1 by anonymous

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The level of water in a burette is at 30 cm3. 400 drops of water each of volume 0.015 cm3 was removed from the burette.

asked Jul 7, 2021 in Physics Form 1 by anonymous

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1 answer

A piece of red-hot charcoal is brought close to the cap of a negatively charged electroscope, Explain what is observed

asked Jun 26, 2021 in Physics Form 1 by Denke

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A metallic box weighs 188N and measures 10cm by 30 cm by 8 cm. Determine the maximum pressure it can exert when lying on one of its surfaces.

asked Jun 21, 2021 in Physics Form 1 by anonymous

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1 answer

A step down transformer has 600 turns in the primary coil. The input voltage is 120 V while the output voltage is 24 V. Determine the number of turns in the secondary coil.

asked Jun 21, 2021 in Physics Form 4 by anonymous

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1 answer

State how eddy currents are minimised in a transformer.

asked Jun 21, 2021 in Physics Form 1 by anonymous

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1 answer

Figure 8 shows two straight conductors P and Q connected to a battery and a variable resistor.

asked Jun 21, 2021 in Physics Form 1 by anonymous

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1 answer

Figure 7 shows a soft iron ring placed between the poles of two bar magnets.

asked Jun 21, 2021 in Physics Form 2 by anonymous

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1 answer

Figure 6 shows a graph of stopping potential against the frequency for a certain photo emissive surface, drawn by a student from the data collected when carrying out an experiment on photoelectric effect.

asked Jun 21, 2021 in Physics Form 4 by anonymous

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1 answer

State one difference between the deflection systems of a cathode ray tube and the television tube.

asked Jun 21, 2021 in Physics Form 4 by anonymous

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1 answer

Name the three components of the electron gun in a cathode ray tube.

asked Jun 21, 2021 in Physics Form 4 by anonymous

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1 answer

The half life of a certain radioactive substance is 24 days. Given that the initial sample of the substance has a mass of 64 g, determine the mass which is left after 72 days.

asked Jun 21, 2021 in Physics Form 4 by anonymous

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Arrange the following electromagnetic waves in the order of decreasing frequency: Microwaves; Gamma rays; Radiowaves; X-rays.

asked Jun 21, 2021 in Physics Form 4 by anonymous

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1 answer

Figure 5 shows a radioactive element placed in an evacuated glass chamber. The element produces alpha, beta and gamma emissions.

asked Jun 21, 2021 in Physics Form 4 by anonymous

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The following is a nuclear reaction equation: 63Li+10n →31H +xyP Determine the values of x and y.

asked Jun 21, 2021 in Physics Form 4 by anonymous

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