MCQ Resistors|75 Objective Questions And Answers On Resistance

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75 Questions and Answers on Resistance

1.1 Resistance is measured in
• a Volts
• b Amperes
• c Ohms
• d Watts

1.2 The resistance of a conductor is directly
proportional to
• a The length
• b The cross-sectional area
• c The velocity
• d The pressure

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1.3 The resistance of a conductor is inversely
proportional to
• a The length
• b The resistivity
• c The cross-sectional area
• d The pressure

1.4 Which of the following is a good conductor?
• a Porcelain
• b Mica
• c Copper
• d Rubber

1.5 Which of the following is a good insulator?
• a Aluminium
• b Ebonite
• c Iron
• d Steel

1.6 The resistance of a pure metal
• a Is unaffected by temperature
• b Increases with temperature rise
• c Decreases with temperature rise
• d Always remains constant

1.7 Carbon has a negative temperature coefficient.
This means that the resistance of
carbon
• a Increases with temperature rise
• b Decreases with temperature rise
• c Is unaffected by temperature changes
• d Is the same as the resistance of copper

1.8 Doped silicon is classed as
• a A conductor
• b A semiconductor
• c An insulator
• d An impurity

1.9 The diagram shows a 3300 ± 10% resistor. The colour bands 1 to 4 are
• a Brown red blue silver
• b Orange orange red silver
• c Orange red orange gold
• d Yellow red green gold

1.10 If the resistor in Question 1.9 has a value of 15 ± 2%, the colour bands 1 to 4 are
• a Brown green brown brown
• b Brown green brown red
• c Brown green brown gold
• d Brown green black red

1.11 If the resistor in Question 1.9 has a value of 0.82 ± 1%, the colour bands 1 to 4 are
• a Grey red silver brown
• b Red grey brown silver
• c Grey red brown red
• d Red grey brown red

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1.12 If the resistor in Question 1.9 has a value of 1000 ± 5%, the colour bands 1 to 4 are
• a Black brown red brown
• b Brown black red gold
• c Red black brown red
• d Brown red black silver

1.13 A resistor is shown on a circuit diagram as lk5F. The ohmic value is
• a 150 ± 10%
• b 15 ± 5%
• c 15 ± 2%
• d 1500 ± 1%

1.14 A 1M8M resistor has a value of U a 180 ± 5%
• b 180000 ± 10%
• c 1 8 0 0 0 0 0 ± 20%
• d 18000 ± 2 %

1.15 If a resistor is shown as R56F, the ohmic value is
• a 56 ± 10%
• b 0.56 ± 1%
• c 5.6 ± 2%
• d 560 ± 1%

1.16 A 120RJ resistor has a value of
• a 1.2 ± 1%
• b 12 ± 10%
• c 120 ± 5%
• d 1200 ± 2%

1.17 Which one of the following is not a preferred value in the ±10% resistor range?
• a 820
• b 2700
• c 4800
• d 5600

1.18 The lower limit value of a 150R ± 10% resistor is
• a 115
• b 125
• c 135
• d 145

1.19 The upper limit value of a 56kK resistor is
• a 58 200
• b 61600
• c 65 000
• d 68400

1.20 An 820R resistor with a tolerance of ±10% has a resistance spread of
• a 690-854
• b 700-864
• c 738-902
• d 780-944

1.21 The physical size of a resistor determines
• a The voltage rating
• b The current rating
• c The power rating
• d The temperature rating

1.22 The diagram shows two resistors connected in series. The combined resistance R is
• a 540R
• b 620R
• c 640R
• d 700R

1.23 If Rx in question 1.22 is changed to 3k3, the
combined resistance R is
• a 347R
• b 3470R
• c 3747R
• d 3770R

1.24 The diagram shows two resistors connected
in parallel. The combined resistance R is
• a 24R
• b 26R
• c 28R
• d 30R

1.25 If R2 in Question 1.24 is changed to 10R,
the combined resistance R is
• a 2R
• b 4.5R
• c 8R
• d 9.5R

1.26 The resistance of a cable 9133m long having a radius of 5 mm and a specific resistance of 1.72 × 10″ 8 Ùðé is approximately
• a 16 i l
• b 10 Ù
• c 2 Ù
• d 0.6 Ù
1.27 If a cable has a resistance of 0.5 Ù, a radius of 2 mm and a specific resistance of 1.72 X É Ï -8 Ù é ç , the length is approximately

• a 240 m
• b 365 m
• c 406 m
• d 485 m

1.28 If the resistance of the cable in Question 1.27 is 2 Ù, the length is approximately
• a 1461 m
• b 1524 m
• c 1595 m
• d 1611 m
1.29 If the radius of the cable in Question 1.27 is increased to 3 mm, the length is pproximately
• a 1020 m
• b 628 m
• c 822 m
• d 426 m
1.30 A cable is 400 m long and has a resistance
of 0.2 Ù. If the specific resistance of the
conductor is 1.72 X 10~
8
Ù ç é , the radius is
approximately
• a 2.6 mm
• b 3.3 mm
• c 4.0 mm
• d 4.7 mm
1.31 If the cable in Question 1.30 was doubled in
length, and it was a requirement to maintain
the same parameters, the radius of the cable
would need to be approximately
• a 3.48 mm
• b 4.68 mm
• c 10.68 mm
• d 12.68 mm
1.32 The upper limit resistance value of a 10%
resistor is 5170 Ù. The nominal value is
• a 4500 Ù
• b 4600 Ù
• c 4700 Ù
• d 4800 Ù
1.33 The lower limit of a 5% resistor is 209 Ù.
The nominal value is
• a 215 Ù
• b 220 Ù
• c 225 Ù
• d 230 Ù
1.34 The upper limit of a 2% resistor is 10 200 Ù
The nominal value is
• a 9200 Ù
• b 9600 Ù
• c 9800 Ù
• d 10000 Ù

1.35 The lower limit of a 20% resistor is 544 i l
The nominal value is
• a 680 Ù
• b 710 Ù
• c 580 Ù
• d 744 Ù
1.36 The upper limit of a 1% resistor is 101 Ù.
The nominal value is
• a 85 Ù
• b 90 Ù
• c 95 Ù
• d 100 Ù
1.37 The lower limit of a 2% resistor is 147 Ù
The nominal value is
• a 150 Ù
• b 160 Ù
• c 148 Ù
• d 152 Ù
1.38 A copper conductor has a resistance of 4 Ù
at 24 °C. If the temperature coefficient at
24 °C is 0.0039/°C, the resistance at 48 °C
is
• a 4.25 Ù
• b 4.29 Ù
• c 4.33 Ù
• d 4.37 Ù
1.39 If the resistor in Question 1.38 had a
resistance of 12 Ù, the resistance at 48 °C
would be
• a 12.09 Ù
• b 13.12 Ù
• c 14.16 Ù
• d 14.29 Ù
1.40 A copper conductor has a resistance of 3 Ù
at 16 °C and a temperature coefficient of
0.0039/°C. If the temperature is raised until
the resistance is 3.16 Ù the approximate
value of the temperature then is
• a 18°C
• b 22°C
• c 26°C
• d 30°C
1.41 If the resistance of the conductor in Question
1.40 had reached 3.5 Ù, the approximate
value of the temperature would be
• a 59.2 °C
• b 58.7 °C
• c 54.2 °C
• d 53.6 °C
1.42 A conductor has a resistance of 10 Ù at
15 °C and a resistance of 10.6 Ù at 30 °C.
The temperature coefficient at 15 °C is
• a 0.0039/°C
• b 0.004/°C
• c 0.0042/°C
• d 0.0043/°C
1.43 Four resistors in series with values of lk5,
3k3, 3k9 and 4k7 will have a combined
value of
• a 9k2
• b 10k4
• c 13k4
• d 15k6
1.44 Four resistors connected in series have a
combined resistance value of 885R. If three
of the resistors have values of 150R, 330R
and 390R, the value of the fourth is
• a 10R
• b 15R
• c 68R
• d 120R

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1.45 Two resistors connected in parallel have a
combined resistance value of 21R. One
resistor has a value of 70R. The value of the
second is
• a 30R
• b 35R
• c 60R
• d 70R
1.46 Three resistors having values of 120R,
150R and 330R are connected in parallel.
The combined resistance is approximately
• a 40.46R
• b 46.46R
• c 50.46R
• d 55.46R

1.47 Three resistors are connected in parallel.
The combined resistance is 120R. Two of
the resistors have values of 240R and 600R.
The value of the third is
• a 120R
• b 240R
• c 360R
• d 400R
1.48 If the combined resistance in Question 1.47
is 82R76, the value of the third is
• a 100R
• b 160R
• c 180R
• d 200R
1.49 Four 680R resistors are connected in parallel.
The combined resistance is
• a 170R
• b 280R
• c 340R
• d 400R
1.50 Two 150R ± 10% resistors are connected in
series. The overall resistance is
• a 300R ± 5%
• b 300R ± 10%
• c 300R ± 15%
• d 300R ± 20%
1.51 A 100R ± 5% resistor is connected in series
with a 150R ± 10% resistor. The overall
resistance value is
• a 250R ± 5%
• b 250R ± 10%
• c 250R ± 8%
• d 250R ± 7.5%
1.52 Three resistors having values of 100R ± 1 %,
100R ± 2% and 100R ± 10% are connected
in series. The overall resistance value is
• a 300R ± 1%
• b 300R ± 3.33%
• c 300R ± 2%
• d 300R ± 4 . 3 3%
1.53 Three resistors having values of IkOJ, IkOK
and IkOM are connected in series. The
overall value of the resistance is
• a 3000 Ù ± 10.66%
• b 3000 Ù ± 11.33%
• c 3000 Ù ± 11.66%
• d 3000 Ù ± 12.66%
1.54 Two 100R ± 10% resistors are connected in
parallel. The overall resistance is
• a 45R ± 5%
• b 50R ± 5%
• c 45R ± 10%
• d 50R ± 10%
1.55 A 100R ± 10% resistor is connected in
parallel with a 100 R ± 20%. The overall
tolerance of the combined resistance is
approximately
• a ±10%
• b ±15%
• c ±20%
• d ±25%
1.56 Three 150R ± 1 0 % resistors are connected
in parallel. The combined resistance is
• a 50R ± 3.33%
• b 50R ± 5%
• c 50R ± 6.67%
• d 50R ± 10%
1.57 Four resistors connected in parallel have an
equivalent resistance value of 75R. Three of
the resistors have values of 400R, 300R and
150R. The value of the fourth is
• a 800R
• b IkO
• c lk2
• d lk4

1.58 In the diagram the value of the overall
resistance R is
• a 30R
• b 36R
• c 40R
• d 66R

1.59 Resistor R2 in Question 1.58 is changed in
order to make the value of R 84R. The value
of R2 is
• a 100R
• b 200R
• c 240R
• d 320R
1.60 In the diagram the value of the overall
resistance R is
• a 200R
• b 150R
• c 450R
• d 300R

1.61 Resistor R2 in Question 1.60 is changed in
order to make the value of R 21 OR. The
value of R2 is
• a 330R
• b 450R
• c 750R
• d 550R

1.62 Resistor Rx in Question 1.60 is changed in
order to make the value of R 187R5. The
value of R] is
• a 50R
• b 75R
• c 100R
• d 150R
1.63 In the diagram the value of the overall
resistance R is
• a 75R
• b 90R
• c 98R
• d 100R

1.64 Resistor /?j in Question 1.63 is changed in
order to make the value of R 680R. The
value of R] is
• a 660R
• b 590R
• c 470R
• d 330R
1.65 Resistor R2 in Question 1.63 is changed in
order to make the value of R 94R. The value
of R2 is
• a 60R
• b 70R
• c 80R
• d 82R

1.66 Resistor R3 in Question 1.63 is changed in
order to make the value of R 166R. The
value of R3 is
• a 440R
• b 480R
• c 520R
• d 600R

1.67 Resistor R4 in Question 1.63 is changed in
order to make the value of R 470R. The
value of R4 is
• a 390R
• b 410R
• c 430R
• d 450R
1.68 In the diagram the value of the overall
resistance R is
• a 300R
• b 400R
• c 500R
• d 600R

1.69 Resistor Rx in Question 1.68 is changed in
order to make the value of R 640R. The
value of Rx is
• a 500R
• b 600R
• c 700R
• d 800R

1.72 In the diagram the value of the overall
resistance is
• a 80R25
• b 87R35
• c 91R15
• d 93R75

1.73 Resistor Rx in Question 1.72 is changed in
order to make the value of R 187R5. The
value of Rx is
• a 675R
• b 700R
• c 750R
• d 800R

1.74 Resistor R2 in Question 1.73 is changed in
order to make the value of R 218R75. The
value of R2 is
• a lk5
• b lk6
• c lk65
• d lk75
1.70 Resistor R2 in Question 1.68 is changed in
order to make the value of R 280R. The
value of R2 is
• a 45R
• b 50R
• c 60R
• d 65R
1.75 Resistor R3 in Question 1.73 is changed in
order to make the value of R 225R. The
value of R3 is
• a 2kl5
• b 2kl25
• c 4kl25
• d 4k25
1.71 Resistor R3 in Question 1.68 is changed in
order to make the value of R 560R. The
value of R3 is
• a IkO
• b lkl
• c lk2
• d lk4