abhinaysingh525 When a ring of metal is heated what happens to its hole? (1) expands (2) contracts (3) it expands or contracts according to its diameter (4) it expands or contracts according to its coefficient of expansion Answer: (1) The hole size will increase because in expansion the size between two molecules do not increase so when … Read more
The mass of a star is two times the mass of the Sun. How it will come to an end? (1) Neutron Star (2) Blackhole (3) White Dwarf (4) Red Giant Answer: (1) The mass of a star which is two times the mass of the sun turns into a neutron star. A neutron star is … Read more
Why the needle of iron swims on the water surface when it is kept gently? (1) It will remain under the water when it will displace more water than its weight (2) the density of the needle is less than that of the water (3) due to surface tension (4) due to its shape Answer: (3) … Read more
If the diameter of a capillary is doubled, then the rise of water in it will be (1) two times (2) half (3) four times (4) no change Answer: (2) Radius of a capillary tube is inversely proportional to the height of the liquid column. So, if the radius of the tube is doubled, the rise … Read more
Raindrops fall from a great height. Which among the following statements is true regarding it? (1) they fall with that ultimate velocity, which is different for different droplets (2) they fall with the same ultimate velocity (3) their velocity increases and they fall with different velocity on the earth (4) their velocity increases and they fall … Read more
On which of the following techniques photo state machine works? (1) Magnetic Image-Making (2) Thermal Image-Making (3) Electrostatic Image-Making (4) Electromagnetic Image-Making Answer: (3) All Electrostatic Copiers work under the premise that a charge of electricity is placed on an Image Drum which has the ability to retain the electric charge much like a capacitor holds … Read more
One Kilowatt-hour is equal to— (1) 3.6 Mega Joule (2) 3.8 Mega Joule (3) 3.2 Mega Joule (4) 4.0 Mega Joule Answer: (1) The energy 1 kilowatt-hour (kWh) is 3600000 joules or 3.6 megajoules. In physics, energy is an indirectly observed quantity that is often understood as the ability of a physical system to do work … Read more
Which of the following statements is true when we see ‘rainbow’? (1) We face sun and raindrops (2) The Sun remains behind us and we face raindrops (3) In light rainfall, we face Sun (4) The sky remains clear and the sun is at a lower position in the sky Answer: (2) We see rainbows because … Read more
What is the minimum escape velocity of the rocket to be launched into space? (1) 5 Km/Sec. (2) 6 Km/Sec. (3) 11 Km/Sec. (4) 15 Km/Sec. Answer: (3) On the surface of the Earth, the escape velocity is about 11.2 kilometres per second (~6.96 mi/s), which is approximately 34 times the speed of sound (Mach 34) … Read more
How much calorie of energy is released by a boiled egg? (1) 40 (2) 50 (3) 60 (4) 77 Answer: (4) 77-78 calories are released in a large size boiled egg. Boiled eggs are eggs (typically chicken eggs) cooked by immersion in boiling water with their shells unbroken.