Gk Quiz 003 on Physics

What is the minimum escape velocity of rocket to be launched into space ?

The escape velocity is the minimum velocity required to leave a planet or moon. On the surface of the Earth, the escape velocity is about 11.2 km/s, which is approximately 33 times the speed of sound.

The shape of our milky way galaxy is ?

The Milky Way is a rotating barred spiral galaxy full of stars, gas and dust that is 100,000 light-years wide. The bulge is at the center, surrounded by a flat, pancake-shaped disk with spiral arm extensions.

Instrument used to measure the force and velocity of the wind is ?

Ammeter is an instrument for measuring electric current in amperes. Altimeter an instrument for determining altitude attained, especially a barometric or radar device fitted in an aircraft. An audiometer is a machine used for evaluating hearing acuity.

What apparatus is used to locate a submerged object ?

Sonar is a technique that uses sound propagation to navigate, communicate with or detect objects on or under the surface of the water, such as other vessels. Radar is an object-detection system that uses radio waves to determine the range, angle, or velocity of objects. It can be used to detect aircraft, ships, spacecraft, etc. Pulsar is a celestial object, thought to be a rapidly rotating neutron star, that emits regular pulses of radio waves and other electromagnetic radiation at rates of up to one thousand pulses per second. Quasar is a massive and extremely remote celestial object, emitting exceptionally large amounts of energy, which typically has a starlike image in a telescope. It has been suggested that quasars contain massive black holes and may represent a stage in the evolution of some galaxies.

Alfred Nobel invented

Alfred Nobel if Sweden invented Dynamite in 1867, X ray was invented by Wilhelm Roentgen of Germany in 1895, Diesel Engine was invented by Rudolf Diesel of Germany 1892, Dynamo was invented by Michael Faraday of England in 1831.