The property of the eye known as its power of accommodation is controlled by the
- A. pupil
- B. virteous humour
- C. iris
- D. ciliary muscles
A beam of light is incident from air to water at an angle of 30oC. Find the angle of refraction if the refractive index of water is \(\frac{4}{3}\)
- A. 15oC
- B. 18oC
- C. 22oC
- D. 24oC
Which of the following may be used to explain a mirage? i. layers of air near the road surface have varying refractive indices in hot weather. ii. road surfaces sometimes become good reflectors in hot weathers. iii. light from the sky can be reflected upwards after coming close to the road surface.
- A. ii only
- B. ii and iii only
- C. i and iii only
- D. i, ii, and iii only
If the focal length of a camera lens is 20cm, the distance from the film at which the lens must be set to produce a sharp image of an object 100cm away is
- A. 17cm
- B. 20cm
- C. 25cm
- D. 100cm
Which of the following expressions gives the linear magnification produced by a concave mirror of radius of curvature r, if U and V are the object and image distances respectively?
- A. \(\frac{V}{r}\) - 1
- B. \(\frac{2V}{r}\) - 1
- C. \(\frac{U}{r}\) - 1
- D. \(\frac{2U}{r}\) - 1
Radio waves emitted from an antenna are picked up by a radar after reflection from an aircraft in 4 x 10-3S. How far is the aircraft from the antenna? [c = 3 x 108ms-1 ]
- A. 6.0 x 102ms-1
- B. 1.2 x 103km
- C. 3.0 x 103km
- D. 6.0 x 10 5km
Which of the following waves can propagate through a vacuum?
- A. High velocity sound waves
- B. Ultrasonic waves
- C. Acoustic waves
- D. Infra-red waves
Determine the distance between the consecutive antinodes XX if the wavelength is 60cm
- A. 15cm
- B. 30cm
- C. 60cm
- D. 120cm
The relationship between L and the wavelength I of the stationary wave is
- A. 2L = \(\lambda\)
- B. L = \(\lambda\)
- C. L = \(\frac {\lambda}{3}\)
- D. 4L = 3 \(\lambda\)
200g of water at 90°C is mixed with 100g of water at 30°C. What is the final temperature?
- A. 50oC
- B. 60oC
- C. 70oC
- D. 80oC
When the volume of a given mass of gas is halved and its temperature doubled, the pressure
- A. remains constant
- B. increases by a factor of 4
- C. increases by a factor of 3
- D. decreases by a factor of 4
A metal rod 800mm long is heated from 10oC to 95oC. If it expands by 1.36mm, the linear expansivity of the metal is
- A. 2.0 x 102K-1
- B. 2.0 x 102K-1
- C. 5.0 x 10-3K-1
- D. 2.0 x 10-5K-1
The thermometric properties of the thermocouple is that is
- A. e.m.f. changes with temperature
- B. resistance changes with temperature
- C. volume changes with temperature
- D. pressure changes with resistance
An object of mass 400g and density 600kgm-3 is suspended with a sting so that half of it is immersed in paraffin of density 900kgm-3. The tension in the string is
- A. 1.0N
- B. 3.0N
- C. 4.0N
- D. 5.0N
A weightless vessel of dimensions 4m x 3m x 2m is filled with a liquid of density 1000kgm-3 and sealed. What is the maximum pressure this container can exert on a flat surface? [g = 10ms-2]
- A. 9 x 104NM-2
- B. 4 x 104NM-2
- C. 3 x 104NM-2
- D. 2 x 104NM-2
A plane inclined at angle \(\theta\) has a velocity ratio of 10 : 1. The inclination of the plane to the horizontal is given by
- A. tan\(\theta\) = \(\frac{1}{10}\)
- B. cot\(\theta\) = \(\frac{1}{10}\)
- C. cos\(\theta\) = \(\frac{1}{10}\)
- D. sin\(\theta\) = \(\frac{1}{10}\)
Which of the following correctly describes the energy changes in the generation of light by a hydroelectric power station?
- A. Electrical \(\to\) mechanical \(\to\) potential
- B. potential \(\to\)mechanical \(\to\)electrical \(\to\) light
- C. mechanical \(\to\) sound \(\to\) electrical \(\to\) light
- D. kinetic \(\to\) mechanical \(\to\) electrical \(\to\)light
The force experienced by an object of mass 60.0kg in the moon’s gravitational field is 1.002 x 102N. What is the intensity of the gravitational field?
- A. 0.60Nkg-1
- B. 1.67Nkg-1
- C. 6.12 x 102Nkg-1
- D. 9.81ms-2
A rocket burns fuel at the rate of 10kgs-1 and ejects it with velocity of 5 x 103ms-1. The thrust exerted by the gas on the rock is
- A. 2.5 x 107N
- B. 5.0 x 104N
- C. 5.0 x 102N
- D. 2.0 x 10-3N
Two forces of magnitudes 7N and 3N act at right angles to each other. The angle \(\theta\) between the resultant and the 7N force is given by
- A. cos\(\theta\) = \(\frac{3}{7}\)
- B. sin\(\theta\) = \(\frac{3}{7}\)
- C. tan\(\theta\) = \(\frac{3}{7}\)
- D. cot\(\theta\) = \(\frac{3}{7}\)
The external and internal diameter of a tube are measured as (32 ± 2)mm and (21 ± 1)mm respectively. Determine the percentage error in the thickness of the tube.
- A. 27%
- B. 14%
- C. 9%
- D. 3%