Which of the following is an electromagnetic wave ?
Cathode rays
Sound wave
Ultrasonic wave
Infra red rays
Answer: Option D
Similar Questions :
1. Who discovered Diode Bulb ?
Henry Becquerel
Sir J.S. Fleming
Lee De Forest
Archemedes
Answer: Option B
Explanation:
Sir J.S. Fleming discovered Diode Bulb in 1904,
Lee De Forest discovered Triode Bulb in 1906,
Archemedes discovered laws of floatation in 1827,
Henry Becquerel discovered Radioactivity in 1896.
2. When a body is immersed partly or wholly in a liquid, there is an apparent loss in weight of the body which is equal to the weight of liquid displaced by the body.
True
False
Answer: Option A
Explanation:
TRUE, it is Archimedes Principle.
3. Harry Brearley has invented
Electric iron
Electromagent
Stainless Steel
Gramophone
Answer: Option C
Explanation:
Harry Brearley of England has invented Stainless Steel in 1913,
Electric iron has been invented by H.W. Seeley of USA in 1882,
Electromagent has been invented by W.Sturgeon of England in 1824,
Gramophone has been invented by T.A. Edison of USA in 1878.
4. Energy posses by a body in motion is called
Kinetic Energy
Potential Energy
Both of Above
None of Above
Answer: Option A
5. Alfred Nobel invented
X ray
Diesel Engine
Dynamite
Dynamo
Answer: Option C
Explanation:
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.