Question 1 : Images formed by plane mirrors are ————-
diminished
enlarged
laterally inverted
real
Question 2 : A battery of emf E and negligible internal resistance is connected to two resistances R1R1 and R2R2 in series. What the potential difference across R2R2?
E(R1+R2)R1E(R1+R2)R1
ER1R1+R2ER1R1+R2
E(R1+R2)R2E(R1+R2)R2
ER2R1+R2ER2R1+R2
Question 3 : What is the current flowing through the voltmeter?
2R A
2R2RA
4R4RA
4R A
Question 4 : Two wires P ad Q, each of the same length and same material, are connected in parallel to a battery. The diameter of P is half that of Q. What fraction of the total current passes through P?
0.50
0.33
0.20
0.25
Question 5 : The physical phenomenon which accounts for apparent depth of a pool of water is called
refraction
polariztion
diffraction
waves
Question 6 : In an experiment with a potentiometer, the balanced length of 30cm was recorded when a standard cell (Daniel cell) of electromotive force E1=1.1VE1=1.1V was introduced in the circuit. The standard cell was then replaced by a Leclanche cell and the balance length recorded was 40cm. The electromotive force E2E2 of the Leclanche cell is —————- to 1 place of decimal
1.4V
0.3V
1.1V
2.1V
Question 7 : A ray of light travels from air to glass. The incident ray makes an angle of 45 degrees while the refracted ray makes and angle of 30 degrees with the normal to the interface. The speed of light in air is 3.0×1083.0×108m/s. What is the of speed of light in glass?
3.00×1083.00×108m/s
2.12×1082.12×108m/s
4.24×1084.24×108m/s
3.73×1083.73×108m/s
Question 8 : A Wheatstone bridge ABCD (labelled in clockwise direction) with a galvanometer G joined to the junctions B and D. A cell E is connected across AC. Resistances of 15, 10, 4 and X ohms are inserted into the arms AB, BC, CD and DA respectively. The value of X is ——- ohms
2.13
3.22
2.67
1.34
Question 9 : In an experiment to determine the relationship between the current I through a piece of tungsten wire and the potential difference V across it, the theoretical relationship used was I=kVnI=kVn , where k and n are constants which may be obtianed from a straight line graph of the form y = mx + c, the symbols having their usual meaning. The corresponding linear equation for this experiment is ———-
I = nV + k
I=expVn+kI=expVn+k
logI = nlogV + logk
4I=nV2+k4I=nV2+k
Question 10 : What is the reading of the voltmeter
6V
zero
between zero and 3 V
3 V
Question 11 : Two resistances 2Ω2Ω and 3Omega3Omega are in parallel. The combination is in series with 1.5ΩresistanceandapowersupplyofvoltageV.Thereisacurrentof3Athroughthe1.5ΩresistanceandapowersupplyofvoltageV.Thereisacurrentof3Athroughthe2\Omega4 resistane. What are the values of the current I delivered by, and the voltage V across the power supply?
12A and 18V
4A and 9V
4A and 12V
3A and 10.5V
Question 12 : Beyond the critical angle, a ray of light moving from dense to rare medium suffers ———–
diffraction
total internal reflection
total internal refraction
polarization
Question 13 : In the circuit shown, what is the current flowing through the battery?
1.7A
3.1A
4.7A
2.6A
Question 14 : In the circuit shown, resistors X and Y, each of resistance R, are connected to a 6V battery of negligible internal resistance. A voltmeter, also of resistance R is connected across Y. What is the current flowing through X?
4R4RA
4R A
2R A
2R2RA
Question 15 : In the circuit shown, what is the equivalent resistance in the circuit?
6.3ΩΩ
4.7ΩΩ
3.7ΩΩ
2.5ΩΩ
Question 16 : A current of 0.5A flowing through a wire produces 21J of heat in 1/2 min. The resistance of the wire is ———– ohms to 1 place of decimal
1.4ΩΩ
4.6ΩΩ
3.2ΩΩ
2.8ΩΩ
Question 17 : The physical principle which accounts for the travelling of sound through longer distances at night is called———–
diffraction
polariztion
waves
refraction
Question 18 : The ———— of the eye plays an equivalent role of the screen in optical experiments
retina
optic nerve
iris
lens
Question 19 : constant 60V d.c. supply is connected across two resistors of resistances 400kΩ400kΩ and 200kΩ200kΩ. What is the reading of of the voltmeter, also of resistance 200kΩ200kΩ when connected across the 200kΩ200kΩ resistor?
30V
12V
20V
15V
Question 20 : An electrical source with internal resistance r is used to operate a lamp of resistance R. What fraction of the total power is delivered to the lamp?
RrRr
RR+rRR+r
R−rRR−rR
R+rRR+rR
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