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What is the wavelength of the visible spectrum?

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Important Questions on Physics

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DRDO MTS Tier - II
IMPORTANT
General Science for Competitive Exams>Chapter 1 - Physics>MCQs>Q 221
Optic fibres are mainly used for which of the following?
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General Science for Competitive Exams>Chapter 1 - Physics>MCQs>Q 223
Old-written material, which cannot be read easily, can be read by:
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General Science for Competitive Exams>Chapter 1 - Physics>MCQs>Q 225
How are the dark lines in the solar spectrum formed? 
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DRDO MTS Tier - II
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General Science for Competitive Exams>Chapter 1 - Physics>MCQs>Q 226

Which of the following is/are examples of electromagnetic waves?

1. X-rays

2. Ultrasonic

3. β-rays

4. α-rays

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DRDO MTS Tier - II
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General Science for Competitive Exams>Chapter 1 - Physics>MCQs>Q 230
The correct sequence of various regions in the absorption spectrum is:
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DRDO MTS Tier - II
IMPORTANT
General Science for Competitive Exams>Chapter 1 - Physics>MCQs>Q 232

Which of the following statements about the refrigerator is/are correct?

1. It converts electrical energy into heat energy.

2. It converts electrical energy into mechanical energy.

3. It transfers heat from a high temperature to a low temperature.

4. It transfers heat from a low temperature to a high temperature.

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DRDO MTS Tier - II
IMPORTANT
General Science for Competitive Exams>Chapter 1 - Physics>MCQs>Q 233
Cryogenic engines find applications in:
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DRDO MTS Tier - II
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General Science for Competitive Exams>Chapter 1 - Physics>MCQs>Q 234

Which of the following take place when the subject speaks untruth while being tested by the polygraph instrument?

1. His blood pressure goes up

2. His pulse quickens

3. His skin darkens

4. He sneezes