Previous year MCQs

General science UPPSC 2009 GS-I
Question

A fluorescent tube is preferred to an electric bulb because:

Answer & Solution

Answer: (Detailed Solution Below)

Option C: In a tube electrical energy is almost full converted into light.

Detailed Solution:

The correct answer is “In a tube electrical energy is almost full converted into light.”.
A fluorescent tube is preferred to an electric bulb because almost all of the electrical energy in a tube is converted into light. This makes fluorescent tubes more energy efficient than electric bulbs.

Similar Questions:

Consider the following statements about human brain:

1. The brain is responsible for regulating the heart beat.
2. It is responsible for balancing the body.

Select the correct answer using the codes given below.
Codes :
  1. A) Only 1 is correct
  2. B) Only 2 is correct
  3. C) 1 and 2 both are correct
  4. D) Neither 1 nor 2 is correct
The dengue fever is caused by the bite of which of the following mosquitoes ?
  1. A) Asian tiger mosquito
  2. B) Aedes
  3. C) Culex
  4. D) Anopheles
What is the source of electrical energy in an artificial satellite?
  1. A) Solar cells
  2. B) Mini nuclear reactor
  3. C) Dynamo
  4. D) Thermopile
Assertion (A): Lighting a candle in space does not produce a flame.
Reason (R): A flame exists due to the pull of gravity.

In the context of the above, which one of the following is correct?
  1. A) Both (A) and (R) are true and (R) is the correct explanation of (A).
  2. B) Both (A) and (R) are true, but (R) is not the correct explanation of (A).
  3. C) A) is true, but (R) is false.
  4. D) (A) is false, but (R) is true.
The disease caused due to deficiency of iron is known as:
  1. A) Colour-blindness
  2. B) Night-blindness
  3. C) Anaemia
  4. D) Tuberculosis
An artificial satellite can be tracked very precisely from the earth by using:
  1. A) Doppler effect
  2. B) Radar
  3. C) Sonar
  4. D) Pulsar
Solar energy is converted into electric energy through
  1. A) Dry cells
  2. B) Leclanche cells
  3. C) Voltaic cells
  4. D) Photo voltaic cells
"Radioactive dating" is a technique which can be used to measure:
  1. A) the age of rocks
  2. B) composition of rocks
  3. C) colour of rocks
  4. D) weight of rocks
Consider the following statements:

Assertion (A): India's nuclear policy incorporates its unpreparedness to open its nuclear plants for international inspection.
Reason (R): India will not produce any nuclear bomb.

Select your answer from the code given below:
  1. A) Both (A) and (R) are true and (R) is the correct explanation of (A)
  2. B) Both (A) and (R) are true but (R) is not the correct explanation
  3. C) (A) is true and (R) is false
  4. D) (A) is false but (R) is true
At which temperature superconductivity can be of tremendous economic interest saving billions of rupees?
  1. A) At very low temperature
  2. B) At a temperature when semiconductor becomes a superconductor
  3. C) At room temperature
  4. D) At a very high temperature
Image formed on Retina is:
  1. A) Equal to object but inverted
  2. B) Smaller than object but straight
  3. C) Smaller than object but inverted
  4. D) Equal to object but straight
The smallest unit of length is
  1. A) micron
  2. B) nanometre
  3. C) angstrom
  4. D) fermi-metre