Physics Past Questions And Answers
\(^{27}_{13}Al\) + \(^{1}_{0}n\) \(\Rightarrow\) \(^{24}_{11}Na\) + X
- A. a proton
- B. a gamma ray
- C. a helium particle
- D. an alpha particle
A current of 100mA passes through a conductor for 2 minutes. The quantity of electricity transported is
- A. 200C
- B. 50C
- C. 12C
- D. 0.002C
The differences observed in solids, liquids and gases may be accounted for by
- A. their relative masses
- B. their melting points
- C. the spacing and forces acting between the molecules
- D. the different molecules in each of them
In 24 days a radioactive isotope decreases in mass from 64g to 2g. What is the half life of the radioactive material
- A. 0.75 days
- B. 2.58 days
- C. 4 days
- D. 4.80 days
A ship travelling towards a cliff receives the echo of its whistle after 3.5 seconds. A short while later, it receives the echo after 2.5 seconds. If the speed of sound in air under the prevalling condition is 250ms -1, how much closer is the ship to the cliff?
- A. 10m
- B. 350m
- C. 175m
- D. 125m
Which of the following liquids has the highest surface tension?
- A. Soapy water
- B. Cold water
- C. Hot water
- D. oily water
The fuse in an electric device is always connected to the
- A. neutral side of an electric supply
- B. earth side of an electric supply
- C. live side of an electric supply
- D. terminal side of an electric supply
What is the relationship mechanical advantage (MA) velocity Ratio (V.R) and efficiency with percentage?
- A. e = M.A/V.R × 100 %
- B. M.A = E.V.R
- C. V.R = 1 ÷ sin θ M.A
- D. M.A = 1/E × 100%
When an astronomical telescope is in normal adjustment, the focal length of the objective lens is 50cm and that of the eyepiece is 2.5om. What is the distance between the lenses?
- A. 20.0cm
- B. 47.5cm
- C. 50.0cm
- D. 52.5cm
(a) Explain the following terms:
(i) mass defect;
(ii) binding energy of a nucleus.
(b)(i) Assuming the wave nature of an electron, what is the effect of decreasing the speed of a photoelectron on its; (\(\alpha\)) wavelength? (\(\beta\)) energy?
(ii) A particle of friasS 4.4 x 10\(^{-23}\) kg moves with a velocity of 10\(^5\)ms\(^{-1}\). Calculate its wavelength. (h = 6.6 x 10\(^{-34}\) Js)
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The diagram below shows part of a radioactive decay series. Use it to answer the following questions.
(i) Name a pair of isotopes.
(ii) Name the isotopes with which the series starts.
(iii) Write down a nuclear equation for two ekgmples of each of: (\(\alpha\)) alpha decay; (\(\beta\)) beta decay.
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