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Physics

Physics
Permissible noise level at Residential area during night time is :

45 dB (A)
55 dB (A)
75 dB (A)
80 dB (A)

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Physics
A mass of 20 kg is at a height of 8 m above the ground. Then the potential energy possessed by the body is: [Given g = 9.8 m/s2]

1568 N
1568 C
1568 J
1568 W

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Physics
Which one of the following animals can hear ultrasonic sound ?

Rat
Squirrel
Bat
Cat

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Physics
One thousand microns is equal to

10-9m
10-3m
10-6m
10-12m

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Physics
What is the full form of "RADAR" ?

Radio Device and Ranging
Radio Detect and Rangs
Radio Detecting and Ranging
Region Device and Ranging

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Physics
The frequency of direct current is ________

100 HZ
50 HZ
Zero
60 HZ

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