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Q:

A standing wave occurs when

A) a wave reflects upon itself B) the amplitude of a wave exceeds its wavelength
C) two waves overlap D) the speed of the wave is zero or near zero
 
Answer & Explanation Answer: A) a wave reflects upon itself

Explanation:

A standing wave also known as a stationary wave, is a wave in which its peaks or any other point on the wave do not move spatially.

This phenomenon can occur because the medium is moving in the opposite direction to the wave, or it can arise in a stationary medium as a result of interference between two waves traveling in opposite directions. The most common cause of standing waves is the phenomenon of resonance, in which standing waves occur inside a resonator due to interference between waves reflected back and forth at the resonator's resonant frequency.

 

Hence, standing wave occurs when a wave reflects upon itself.

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Filed Under: Physics
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Q:

Which of the statements given below are correct?

 

A) Rafael Nadal won the Tennis 2017 Wimbledon Championships Men's Singles.


B) Aryan Tari won the 2017 World Junior Chess Championship.


C) Viktor Axelsen won the Men's Singles Badminton 2017 BWF World Championships.

 

A) Only A B) Only B
C) Both B and C D) None of these
 
Answer & Explanation Answer: C) Both B and C

Explanation:
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Filed Under: Sports
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Q:

Landstrom invented

A) Metallurgy B) Gas Engine
C) Safety Match D) None of these
 
Answer & Explanation Answer: C) Safety Match

Explanation:
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Filed Under: Inventions

6 8833
Q:

Japan invaded Manchuria in 1931 because

 

A) Japan wanted to take back lands that belonged to it B) Manchuria had refused to make peace with Japan
C) Manchuria had invaded Japan during World War I D) Japan wanted raw materials and natural resources
 
Answer & Explanation Answer: D) Japan wanted raw materials and natural resources

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Filed Under: World History
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Q:

The most important cause for the outbreak of the Ghaddar revolution was the

A) Commencement of World War I B) Hanging of Kartar Singh Sarabha
C) Kamagato Maru Incident D) Arrest of Lala Hardayal
 
Answer & Explanation Answer: C) Kamagato Maru Incident

Explanation:
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Filed Under: Indian History

12 8823
Q:

In diseases like Polio, the cells that get destroyed by virus, are

A) Monocytes B) Erythrocytes
C) Motor neurons D) Sensory neurons
 
Answer & Explanation Answer: C) Motor neurons

Explanation:
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Filed Under: Biology

42 8822
Q:

The effects of any drug depend on

 

 

A) The amount taken at one time B) The circumstances under which the drug is taken such as the simultaneous use of alcohol or other drugs, etc.
C) How the drug is consumed D) All the above
 
Answer & Explanation Answer: D) All the above

Explanation:
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Filed Under: Biology
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3 8821
Q:

When was the "Boxer Rebellion" happened in China?

 

A) 1895   B) 1900  
C) 1905   D) 1909
 
Answer & Explanation Answer: B) 1900  

Explanation:
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Filed Under: World History
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