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First boys are seated in 7 position in 7! Ways. Now remaining 2 places can be filled by 2 girls in 2! Ways. So, number of ways = 7! × 2! = 10080
A force of 50 N moves a body 2 meters in the direction of the force. Find work done.
What is the electrical charge of a neutrino?
The refractive index of glass is 1.5. What is the speed of light in glass?
(Speed of light in vacuum is 3.0 ×108 m s-1)
Why do brads not have respiratory trouble at the time of flying at high all?
If a lens forms an image of magnification -2, what is the nature of the image?
What is the value of 1 horsepower in watts?
Two tuning forks produce 4 beats per second. If one has a frequency of 256 Hz, the frequency of the other is:
What is the minimum escape velocity of rocket to be launched into space?
A transformer has 1000 turns in the primary and 100 in the secondary coil. If input voltage is 220 V, output voltage is:
Which of the following optical phenomena CANNOT convert unpolarised light to plane polarised light?