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Q:

three_resistors_are_arranged_in_a_circuit_as_shown_above1559105724.PNG image

Three resistors are arranged in a circuit as shown above. The battery has an unknown but constant emf ε and a negligible internal resistance.

Now, determine the equivalent resistance of the three resistors.

A) 12 Ω B) 10 Ω
C) 16 Ω D) 15 Ω
 
Answer & Explanation Answer: A) 12 Ω

Explanation:

From the given circuit,

three_resistors_are_arranged_in_a_circuit_as_shown_above1559105964.PNG image

The resistors R1 and R2 are in parallel connection and R3 is in series with R1 & R2

The equivalent resistance of R1 and R2 is

Req = (12 × 4)/(12 + 4) = 3 Ω.

Adding R3 in series with the pair gives

R = Req + 9

R = 3 + 9

R = 12 Ω.

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Q:

The speed of a boat when travelling downstream is 32 km/h, whereas when travelling upstream it is 28 km/h. What is the speed of the boat in still water?

A) 27 km/h B) 29 km/h
C) 31 km/h D) Cannot be determined
 
Answer & Explanation Answer:

Explanation:

Ans.  Suppose the speed of boat in still water is x km/h and speed of stream is y km/h

Speedof boat in downstream = (x + y) km/h x+ y = 32 …(i) 

Speed of boat in upstream = (x – y) km/h

x – y = 28 …(ii)

Add. Eqs. (i) and (ii), we get 2x = 60

x = 30 km/h

 

 

 

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Q:

Which famous scientist unknowingly founded the field of spectroscopy?

A) Issac Newton B) Galileo
C) Graham Bell D) None of the above
 
Answer & Explanation Answer: A) Issac Newton

Explanation:
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Filed Under: Inventions
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Q:

The ancient goal of astrology was to 

A) make a more accurate model of the universe B) predict human events
C) understand the origin of Earth D) predict the passing of the seasons
 
Answer & Explanation Answer: B) predict human events

Explanation:

The ancient goal of astrology was to predict human events.

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Filed Under: Indian History
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Q:

What does deficit spending require a government to do?

A) cut taxes B) hire more workers
C) lay off workers D) take on debt
 
Answer & Explanation Answer: D) take on debt

Explanation:

Deficit spending means spending more than the income getting. A government need to take debts for deficit spending.

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Filed Under: Indian Politics
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Q:

Most organic compounds contain carbon and

A) Hydrogen B) Nitrogen
C) Potassium D) All of the above
 
Answer & Explanation Answer: A) Hydrogen

Explanation:

Most organic compounds contain carbon and hydrogen.

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Q:

Common alcoholic beverages include

A) Wine B) Cider
C) Beer D) All of the above
 
Answer & Explanation Answer: D) All of the above

Explanation:
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Q:

Where did Harappan civilization develop?

Answer

Harappan or Indus Valley Civilization was the first and ancient civilization which started in what now Pakistan and North West India.


The Harappan civilization existed between 3300 BC and 1300 BC.


Indus_valley_civilization1533212661.jpg image


The ruins of Mohenjo-daro is a major archaeological site that was built by this civilization and is now a UNESCO World Heritage Site.


 

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