Velocity of sound in vacuum is ____________________?
Velocity of sound in vacuum is ____________________?
A. 332 ms-1
B. 320 ms-1
C. Zero
D. 224 ms-1
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Image of an object 5 mm high is only 1 cm high. Magnification produced by lens is__________________?A. 0.5
B. 0.2
C. 1
D. 2The normal blood pressure range for a human body is______________?
The normal blood pressure range for a human body is______________?A. 120 to 80 torr
B. 100 to 80 torr
C. 120 to 60 torr
D. 60 to 140 torrTo find the r.m.s value of an alternating current mathematically we need to have ________________?
To find the r.m.s value of an alternating current mathematically we need to have ________________?A. Mean value of I2
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C. Square root of I2
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S.I unit of frequency is_________________?A. Vibration S-2
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C. Hertz
D. ms-1An inductive coil has a resistance of 100Ω. When an AC signal of frequency 1000Hz is fed to the coil the applied voltage leads the current by 45Ω. What is the inductance of the coil ?
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B. 12mH
C. 16mH
D. 20mHIn case of planets the necessary acceleration is provided by______________?
In case of planets the necessary acceleration is provided by______________?A. Gravitational force
B. Frictional force
C. Coulomb force
D. Centripetal force