# Which instrument is used in submarine to see the objects above sea level ?

• Pykometer
• Polygraph
• Photometer
• Periscope
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• Machine Gun
• Microphone
• Microscope
• Motorcycle

• Telephone
• Telescope
• Television
• Tank

## 3. radian per second is unit of

• Momentum
• Moment of Inertia
• Frequency
• Angle Velocity

## 4. What is escape velocity ?

• Escape velocity is the maximum velocity with which a body should be projected from the surface of earth so it do not go beyond gravitational field of earth.
• Escape velocity is the minimum velocity with which a body should be projected from the surface of earth so it do not go beyond gravitational field of earth.
• Escape velocity is the minimum velocity with which a body should be projected from the surface of earth so as it goes out of gravitational field of earth and never return to earth.
• Escape velocity is the maximum velocity with which a body should be projected from the surface of earth so as it goes out of gravitational field of earth and never return to earth.

## 5. What is the range of mercury thermometer ?

• 0 degree Celsius to 350 degree Celsius
• -10 degree Celsius to 350 degree Celsius
• -20 degree Celsius to 350 degree Celsius
• -30 degree Celsius to 350 degree Celsius
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