NTSE SAT Physics Electricity Ohms Law and Resistance MCQs

Question: A wire of resistance R is cut into n equal parts. These parts are then connected in parallel. The equivalent resistance of combination will be:

• a) nR
• b) R/n
• c) n/R
• d) R/n2

Answer: R/n2

Question: Three resistance each of 8 Ω are connected to a triangle. The resistance between any two terminal :

• a) 12 Ω
• b) 2 Ω 
• c) 6 Ω
• d)

  

Answer:

Question: The filament of an electric bulb is made of tungsten because :

• a) Its resistance is negligible
• b) It is cheaper
• c) Its melting point is high
• d) Its filament is easily made

Answer: Its melting point is high

Question: The smallest resistance that can be obtained from a combination of ‘n’ identical resistor each of resistance R is :

• a)

  

• b)

  

• c) nR
• d) n²R

Answer:

Question: In the circuit shown in Fig., the reading of the voltmeter V will be :

• a) 4 V
• b) 2 V
• c) 6 V
• d) 3 V

Answer: 4 V

Question: What is the total resistance across A and B is the circuit shown in Figure ?

• a) 1 Ω 
• b) 2 Ω
• c) 1.5 Ω  
• d) None of these

Answer: 2 Ω

Question: A person connects four,

cells in series but one cell has its terminal reversed. The external resistance is 1 Ω . If each cell ahs an e.m.f. of 1.5 V, the current flowing is :

• a)

  

• b)

  

• c) 1.5 A
• d) Zero

Answer: 1.5 A

Question: The equivalent resistance between x and y is :

• a)

  

• b)

  

• c)

  

• d) 10 Ω
  

   

Answer:

Question: A wire of resistance R is stretched to four times its initial length . What will be the new resistance :

• a) 16 R
• b) 9 R
• c) 4 R
• d) R

Answer: 16 R

Question:  In the given circuit, the equivalent resistance between points A and B will be.

• a)

  

• b) 4R
• c) 6R
• d) 10R

Answer: 4R