## Workshop Calculation and Science

#### Year 1 Module 7

1: Which machine converts mechanical energy into electrical energy
A : Battery

B : Generator
C : Heater
D : Iron box

2: Which is the unit of current

A : Ampere
B : Volt
C : Ohm
D : Watt

3: Which is the unit of resistance
A : Ampere
B : Volt

C : Ohm
D : Watt

4: What is the flow of electrons in any conductor
A : Voltage

B : Current
C : Resistance
D : Power

5: Which property of a substance is opposing the flow of electric current
A : Current
B : Voltage

C : Resistance
D : EMF

6: Which is very good conductor

A : Copper
B : Cast iron
C : Wrought iron
D : Steel

7: Which is mineral insulator
A : Glass
B : Quartz

C : Mica
D : Porcelain

8: What is the total resistance if three resistances of 3 ohms 9 ohms and 5 ohms are connected in series
A : 11 ohms
B : 7 ohm

C : 17 ohms
D : 1/17 ohms

9: What is the total resistance if two resistances of 4 ohms and 6 ohms are connected in parallel
A :
B :
C :
D :

10: What is the total resistance if three resistances of 4 ohms 6 ohms and 8 ohms respectively are connected in parallel
A : 24
B : 13
C :
D :

11: Which is same in series connection of resistors in a circuit

A : Current
B : Voltage
C : Resistance
D : Power

12: Which law states that at constant temperature the current passing through a closed circuit is directly proportional to the potential difference and inversely proportional to the resistance

A : Ohm´s law
B : Lenz´s law
C : Newton´s law
D : Hooke´s law

13: What is the resistance
I = 11.5 Amps
V = 380 Volts
R = _______Ohms

A : 13 ohms
B : 23 ohms

C : 33 ohms
D : 43 ohms

14: What is the current
R = 50 Ohms
220 Volts
I =______Amps

A : 4.1 Amps
B : 4.2 Amps
C : 4.3 Amps

D : 4.4 Amps

15: What is the voltage
R = 250 Ohms
I = 0.44 Amps
V = _____Volts

A : 100 Volts  100
B : 105 Volts  105
C : 108 Volts  108

D : 110 Volts  110

16: Which statement is correct according to ohm´s law
A : I µ 1/V
B : I µ R

C : I µ V/R
D : I µ R/V

17: What is the filament resistance if a 6 volt bulb draws a current of 0.5 Amps

A : 12 W
B : 10 W
C : 3 W
D : 1.2 W

18: How much watt second in 1 watt hour
A : 1000 watt sec
B : 2000 watt sec

C : 3600 watt sec
D : 4000 watt sec

19: What is the power if an emf of one volt causes a current flow of 1ampere
A : 1 watt
B : 1 kilowatt
C : 1 HP
D : 1 Kilowatt hour

20: Which is equal to electric power
A : R2I watts

B : I2R watts
C :
D :

21: How much power does it consumes if an electric heater draws a current of 10 amps at 200 volts

A : 2000 watts
B : 2010 watts
C : 2020 watts
D : 2030 watts

22: What is the resistance of an electric iron if the rating of electric iron is 220 V and 500 watts
A : 94.8 ohms
B : 95.8 ohms

C : 96.8 ohms
D : 97.8 ohms

23: What is the voltage of the immersion heater
P = 500 watts
I = 2.27 Amps
V = ______Volts

A : 200.3 volts  200.3
B : 210.3 volts  210.3

C : 220.3 volts  220.3
D : 230.3 volts  230.3

24: What is the unit of intensity of magnetic field

A : wb/m
B : m/wb
C : Hertz
D : Coloumb

25: Which law states about electromagnetic induction
A : Ohm´s law
B : Hooke´s law
C : Lenz´s law

D : Faraday´s law

26: What is the formula for induced emf
A : B2L sinq volts
B : BL sinq volts

C : BLV sinq volts
D : B2V sinq volts

27: What does EMF stands for
A : Electronic Magnetic Force

B : Electro Motive Force
C : Electro Magnetic Force
D : Electroplated Force

28: Which is the example for statically induced emf
A : Generator
B : Motor

C : Transformer
D : Refrigerator

29: Which is the example for dynamically induced Emf
A : Motor

B : Generator
C : Car
D : Motor bike

30: Which is the unit electrical power
A : Volts
B : Ohms

C : Watts
D : Ampere

31: What is the current Flow in the bulb
P = 550 watts
R = 22 Ohms
I = ______Amps

A : 2 Amps  2
B : 3 Amps  3
C : 4 Amps  4

D : 5 Amps  5

32: What is the power required
I = 0.455 Amps
R = 484 Ohms
P = _____Watts

A : 98.2 watts
B : 99.2 watts

C : 100.2 watts
D : 101.2 watts

33: What is the rated power if an adjustable resistor bears the following label 1.5 k ohms/ 0.08A
A : 9.2 watts
B : 9.4 watts

C : 9.6 watts
D : 9.8 watts

34: How much voltage will be required to illuminate a 40 watts fluorescent lamp draws a current of 0.10 amperes
A : 390 volts
B : 395 volts

C : 400 volts
D : 405 volts

35: How many hours will take for a 100 watts bulb to consume 1 kwh energy
W = 1 Kwh
P = 100 Watts
t = _____Hours

A : 10 hours
B : 12 hours
C : 18 hours
D : 24 hours