The fundamental property of a propagating wave which depends only on the source and not the medium of propagation is the?
- A. wavelength
- B. harmonics
- C. frequency
- D. velocity
Given the progressive wave equation y = 5 sin (2000 πt – 0.4x), calculate wave length
- A. 12.4 m
- B. 15.7 m
- C. 17.5 m
- D. 18.6 m
In a good thermos flask, heat loss is reduced through the following features EXCEPT?
- A. the lens surface
- B. the insulating cork
- C. silvered walls
- D. the cork lid
If the partial pressure of water vapour at 27°C is 18 mm Hg and the saturated vapour pressure of the atmosphere at the same temperature is 24 mm Hg, the relative humidity at this temperature is?
- A. 25%
- B. 33%
- C. 75%
- D. 82%
A block of aluminum is heated electrically by a 25 W heater. if the temperature rises by 10°C in 5 minutes, the heat capacity of the aluminum is?
- A. 850 JK-1
- B. 750 JK-1
- C. 650 JK-1
- D. 500 JK-1
A sealed flask contains 600cm3 of air at 27°C and is heated to 35°C at constant pressure. The new volume is?
- A. 508 cm3
- B. 516 cm3
- C. 608 cm3
- D. 616 cm3
During summer, the balance wheel of a clock expands.what effect does this have on the accuracy of the clock?
- A. the clock gians time
- B. the accuracy of the clock is not affected
- C. the clock losses time
- D. the clock stops working
The thermometric properties of a thermocouple is the change in?
- A. equivalent resistance
- B. electromotive force
- C. colour
- D. pressure
An empty density bottle weighs 2 N. if it weighs 5 N when filled with water and 4 N when filled with olive oil, the relative density of olive oil is?
- A. (1)/3
- B. (2)/3
- C. (1)/5
- D. (2)/5
When cold water is poured on a can containing hot water, the can collapses because the?
- A. steam condeses and occupies the partial vacuum in the can
- B. external air pressure counter balances the pressure within the can
- C. steam expands to occupy the vacuum remaining in the can
- D. external pressure becomes greater than the pressure within the can.
In the hare’s apparatus, water rises to a height of 26.5 cm in one limb. if a liquid rises to a height of 20.4 cm in the other limb, what is the relative density of the liquid?
- A. 0.8
- B. 1.1
- C. 1.2
- D. 1.3
A spring of force constant 500 NM-1 is compressed such that its length shortens by 5cm. The energy stored in the spring is?
- A. 0.625 J
- B. 6.250 J
- C. 62.500 J
- D. 625.000 J
A motorcycle of mass 100kg moves round in a circle of radius 10m with a velocity of 5 ms-1. find the coefficient of friction between the road and the tyres.
- A. 25.00
- B. 2.50
- C. 0.50
- D. 0.25
counting of currency notes with moist fingers is based on the principles of?
- A. diffusion
- B. cohesion
- C. adhesion
- D. viscosity
If a body mass 5kg is thrown vertically upwards with velocity u,at what height will the potential energy equal to the kinetic energy?
- A. h =(u)2/g
- B. h = (u)2/4g
- C. h = (2u)2/g
- D. h = (u)2/2g
What is the frequency of vibration if the balance wheel of a wrist watch makes 90 revolutions in 25 s?
- A. 0.01 Hz
- B. 0.04 Hz
- C. 2.27 Hz
- D. 3.60 Hz
I. All the three forces must be concurrent.
II. The upward force is equal to the downward force.
III. The algebraic sum of the moment about any point must be zero.
which of the above conditions must hold for a body acted upon by a system of three coplanar forces equilibrium?
- A. I and II only
- B. I and III only
- C. II and III only
- D. I, II and III
If a wheel 1.2 m in diameter rotates at one revolution per second, calculate the velocity of the wheel.
- A. 3.6 ms-1
- B. 3.77 ms-1
- C. 4.0 ms-1
- D. 7.5 ms-1
Which of the following is NOT a vector quantity?
- A. altitude
- B. acceleration
- C. displacement
- D. weight
I. Force (N)
II.Torque (Nm)
III. Current (A)
IV. Power (W)
Which of the above are the correct S. I: units of the quantities indicated?
- A. I and II only
- B. I and III only
- C. I, II and III only
- D. I, II, III and IV only
Silicon doped with aluminum and germanium doped with arsenic become?
- A. p- and n- types respectively
- B. n- en p- type respectively
- C. p- type semiconductor
- D. n- type semiconductors