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
The dimension of young’s modulus,E is given by
- A. MLT\(^{-1}\)
- B. MT\(^{-2}\)
- C. ML\(^{-1}\)T\(^{-2}\)
- D. M\(^{-1}\)T
A rectifier is a device that changes
- A. D.C to D.C
- B. D.C to A.C
- C. A.C to A.C
- D. A.C to D.C
In a solar panel, solar beam is concentrated by using
- A. Concave mirror
- B. Convex mirror
- C. Plane mirror
- D. Triangular mirror
A wheelbarrow inclined at 60º to the horizontal is pushed with a force of 150N. What is the horizontal component of the applied force
- A. 130N
- B. 75N
- C. 60N
- D. 50N
Electrolysis can be investigated using
- A. Voltmeter
- B. Ammeter
- C. Galvanometer
- D. Voltameter
If the S.V.P of water vapour was 13.5mmHg at 33ºC and 7.3mmHg at 7ºC. Find the percentage relative of the air on a day when average air temperature was 33ºC and dew point was 7ºC.
- A. 55%
- B. 60%
- C. 54%
- D. 51%
5 X 10\(^{-3}\)kg of liquid at its boiling point is evaporated in 20s by the heat generated by a resistor of 2\(\Omega\) when a current of 10A is used. The specific latent heat of vaporization of the liquid is
- A. 8.0 x 10\(^4\)Jkg\(^{-1}\)
- B. 8.0 x 10\(^5\)Jkg\(^{-1}\)
- C. 8.0 x 10\(^6\)Jkg\(^{-1}\)
- D. 8.0 x 10\(^7\)Jkg\(^{-1}\)
The value of R required to make the galvanometer measure voltage up to 40V in the diagram above
- A. 1885\(\Omega\)
- B. 1990\(\Omega\)
- C. 1995\(\Omega\)
- D. 1100\(\Omega\)
A solid cube of aluminum is 1.5cm on each edge. The density of aluminum is 2700kgm\(^{-1}\). Find the mass of the cube.
- A. 7.5g
- B. 9.1g
- C. 12.0g
- D. 15.0g
A light ray passing from air into water at an angle of 30º from the normal in air would
- A. make an angle greater than 30\(^0\) in water surface
- B. be completely absorbed by the water surface
- C. be completely reflected by the water surface
- D. make an angle less than 30\(^0\) from the normal in water
Pilots uses aneroid barometer to know the height above sea level because
- A. Very accurate
- B. Small and convenient
- C. Heavy and huge
- D. Costly
When a charged ebonite rod is brought near a charged glass rod, there will be
- A. attraction
- B. repulsion
- C. spark
- D. no force experienced
Which of the following operates based on magnetic effect of electric current?
- A. electric heater
- B. photocell
- C. Dynamo
- D. Cold cathode
The friction due to air mass can be reduced by
- A. streaming
- B. lubricating
- C. propeller
- D. polishing
When a bus is accelerating, it must be
- A. changing its speed
- B. changing its velocity
- C. changing its position
- D. changing its direction
Find the value of a capacitor with voltage 5V and 30C.
- A. 7f
- B. 6f
- C. 15f
- D. 0.17f