Which of the following is the best as shaving mirror?
- A. Concave mirror
- B. Convex mirror
- C. plane mirror
- D. parabolic mirror
In voltage measurement, the potentiometer is preferred to voltmeter because it
- A. has a wider range
- B. consumes negligible current
- C. is bulky
- D. responds faster than voltmeter
A cell of internal resistance of 2\(\Omega\) supplies current through a resistor, X if the efficiency of the cell is 75%, find the value of X.
- A. 2\(\Omega\)
- B. 4\(\Omega\)
- C. 6\(\Omega\)
- D. 8\(\Omega\)
The fourth overtone of a closed pipes is 900Hz, its fundamental frequency is
- A. 50Hz
- B. 100Hz
- C. 200Hz
- D. 400Hz
The average translational kinetic energy of gas molecules depends on
- A. Temperature only
- B. Number of moles and temperature
- C. Pressure and temperature
- D. Pressure only
A load of 300N is to be lifted by a machine with a velocity ratio of 2 and an efficiency of 60%. What effort will be applied to lift the load?
- A. 100N
- B. 150N
- C. 250N
- D. 400N
The process of adding impurities to a semiconductor material to increase its conductivity is
- A. Rectification
- B. Emission
- C. Doping
- D. Stabilization
Which of these gas laws is equivalent to workdone
- A. Charle's law
- B. Pressure law
- C. Boyle's law
- D. Gay Lussac's law
If a body in linear motion changes from point P to Q, the motion is
- A. Translational
- B. Rotational
- C. Simple harmonic
- D. Circular
In a series resonant circuit, the current flowing in the circuit is
- A. maximum
- B. minimum
- C. zero
- D. unaffected
The thermometer whose thermometric property is change in volume with temperature is
- A. Resistance thermometer
- B. Thermocouple
- C. Bimetallic thermometer
- D. Liquid-in-glass thermometer
The distance between two successive crests of a water wave is 0.25m. If a particle on the surface of the water makes four complete vertical oscillations in one second. Calculate the speed of the wave.
- A. 4ms\(^{-1}\)
- B. 3ms\(^{-1}\)
- C. 2ms\(^{-1}\)
- D. 1ms\(^{-1}\)
A mass of gas at 40mmHg is heated from 298k to 348k at constant volume. Cal the pressure exerted by the gas.
- A. 50.21mmHg
- B. 46.71mmHg
- C. 42.35mmHg
- D. 35.12mmHg
The energy of light of frequency 2.0 x 10\(^{15}\)Hz is (h = 6.63 x 10\(^{-34}\)Js)
- A. 3.33 x 10\(^{-18}\)J
- B. 1.33 x 10\(^{-18}\)J
- C. 1.33 x 10\(^{-19}\)J
- D. 3.33 x 10\(^{-19}\)J
How much joules of heat are given out when a piece of iron, of mass 60g and specific heat capacity 460JKg\(^{-1}\)K\(^{-1}\), cools from 75ºC to 35ºC
- A. 1000J
- B. 1050J
- C. 1067J
- D. 1104J
A thick glass tumbler cracks when boiling water is poured into it because
- A. The inside expands more rapidly than the outside
- B. The inside expands less rapidly than the outside
- C. The expansion is even
- D. It does not expand
Which of the following is not a part of model rocket?
- A. The body tube
- B. The nose cones
- C. The fin
- D. Not recovery devices
A sonometer’s fundamental note is 50Hz, what is the new frequency when the tension is four times the original?
- A. 25Hz
- B. 100Hz
- C. 200Hz
- D. 250Hz
288KJ is conducted across two opposite faces of a 3m cube of temperature gradient 90ºCm\(^{-1}\) in 7200s. Calculate the thermal conductivity.
- A. 4.9 x 10\(^{-2}\)Wm\(^{-1}\)k\(^{-1}\)
- B. 5.0 x 10\(^{-2}\)Wm\(^{-1}\)k\(^{-1}\)
- C. 5.2 x 10\(^{-2}\)Wm\(^{-1}\)k\(^{-1}\)
- D. 5.1 x 10\(^{-2}\)Wm\(^{-1}\)k\(^{-1}\)
If a sheet of an insulating material is inserted between the plates of an air capacitor, the capacitance will
- A. become zero
- B. decrease
- C. increase
- D. remain unchanged
The moon’s acceleration due to gravity is \(\frac{1}{6}\) of the earth’s value. The weight of a bowling ball on the moon would be
- A. 6 times its weight on the earth
- B. \(\frac{1}{6}\) of its weight on the earth
- C. 36 times its weight on the earth
- D. equal to its weight on the earth