(1)A circuit has a resistance of 10ohms and an internal resistance of 2ohms.Calculate the efficiency of the internal resistance
(2)Protons were discovered by...
(3)A difference between the telephone ear piece and electric bell is that...
(A)Ear piece has permanent magnet while electric bell has temporary magnet
(B)Electric bell has permanent magnet while ear piece has temporary magnet
©Electric bell has no magnet while ear piece has temporary magnet
(D)Ear piece has permanent magnet while electric bell has no magnet
(4)If the cost of electricity per KWh is #4,what is the cost of operating an electrical appliance rated 2.5V,2A for 6 hours?
(5)In making a magnet by double strokes with the South poles of two magnets.
(A)The other ends of both sides become north
(B)The other ends of both sides become south
©The other ends of both sides have no poles
(D)The starting point of the strokes have no poles
(6)A sound wave was blown into a pipe of 1.5m in length.Calculate the third overtone
(7)A glass prism has a refractive index 1.86.If the prism is immersed in water of refractive index 1.33.Determine the angle of minimum deviation of light tramsversing the prism
(8)An ebonite rubbed with fur attracts a glass rod rubbed with silk because...
(A)Ebonite has a negative charge while glass has a positive charge
(B)Ebonite has a positive charge while glass has a negative charge
©Both have negative charges
(D)Both have positive charges
(9)The mass of a stone is 15g when completely immersed in water and 10g when completely immersed in a liquid of refractive index 2.What is the mass of the stone in air?
(10)Three wires of resistances 2ohms,3ohms and 1 ohm were arranged in a circuit of 12V.Calculate the current through the lowest resistant wire?
(11)Which of these are true of pressure in liquid?
(I)Pressure acts equally in all directions
(II)Pressure decreases with depth
(III)Pressure at the same level of a liquid is the same
(IV)Pressure is independent on the cross sectional area
(A)I and III
(B)I,II and III
©I,III and IV
(12)An exercise book was placed 5cm from a mirror.Calculate the distance of the image from the object
(13)The difference between a simple astronomical telescope and a compound microscope is...
(A)A simple astronomical telescope uses two converging lens while a compound microscope uses one converging and one diverging lens
(B)A simple astronomical telescope uses one converging and one diverging lens while a compound microscope uses two diverging lens
©The eyepiece is greater than the objective in a compound microscope,while it's opposite in a simple astronomical telescope
(D) The objective in compound microscope is greater than the eyepiece in compound microscope,while it's opposite in a simple astronomical telescope
(14)At resonance,the resistance is 15Ohms,while the capacitor reads 5nF with 8mH resistor.Calculate the frequency
(15)A sound was sent to determine the depth of an ocean.If the distance is 10m and the wave returned in 5s.Calculate the velocity of the sound in the ocean
(16)Ice of 20g was heated and turned to steam at 100°C.Calculate the heat supplied.(SHCw=4.2J/g,Lf=336J/g,Lv=2268J/g)
(17)A charge of 200mC has electric field intensity of 400NC¯¹ at a certain point.The electric field strength due to another charge 50mC kept at the same distance apart and in the same medium is...
(18)Which of these is not true about electrostatics?
(A)Opposite charges in the same direction are added
(B)Opposite charges in different directions are added
©Like charges in the same direction are added
(D)Opposite charges in the same direction have no difference
(19)Calculate the efficiency of an inclined plane with the load of 200N on the plane pulled by an effort of 300N and makes an angle of 30° with the horizontal.
(20)The SI for physical units are
Possible Answers, scattered
- MLT -2
- Eq towwards region of higher
-parking or bit
-1.7 x 10 -6 F
- threshold frequency
-a.c voltage determinatin
-1.0 x 10 -3 N
- 1.5 J
-real and magnified
- electroplating and purification of metals
-reflection of sound wave
-pressure on melting point
-outlet III release
-vaporization into the gaseous
-red, orange, yellow,green, blue, indigo, violet
-temperature of the air