1- Helium has the lowest boiling point of any element.
2- Osmium is the densest element.
3- Tungsten has the highest boiling point of all the elements. Hence, it is used for filaments in electric
5- Pure silicon is a semi-conductor and is used in electronic devices as the base for minute integrated circuits (ICs).
6- Mercury is the only metal which is liquid at room temperature. It is very poisonous and affects mental
7- 1 meter distance is equal to the length of 1,650,763.73 wavelength of pure orange lights emitted from Kr-86.
8- If a body is dropped vertically down, and another is projected horizontally then both will reach the ground simultaneously but with different velocity.
9- The ratio to distance traveled in 1st, 2nd, and 3rd seconds of freely falling body is 1:3:5.
10- The ratio of maximum height reached by different bodies projected upwards with different velocity is equal to
11- If a body is dropped from top of a tower of height h and another body is thrown up simultaneously with velocity u from the foot of the tower, then both of them would meet after time h/u.
12- Choke coil works on principle of electro-magnetic induction.
13- If a person projected a ball outside from a moving car, then the path of the ball is a straight line for the person sitting in the car, but It should be a parabola for an observer on the ground.
14- Retro-rocket is used for deceleration of rocket in space.
15- The shape of rain drop is spherical due to surface tension.
16- Goniometer is used in determining angle of
17- Lactometer is used to determining purity of milk.
18- The height of mercury column in barometer is independent of the diameter of glass-tube containing
19- The frequency of second pendulum is 2s.
20- Clouds are flying due to their least density and viscosity of air.
21- Viscosity of gases increases with increase in temperature.
22- The force of attraction between atoms of the same material is called cohesive force.
23- The force of attraction between atoms of different material is called adhesive force
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24- Candalescent of tube-light is always greater than that of electric bulb of the same power
25- 1 KW = 1.34 HP
24- Candalescent of tube-light is always greater than that of electric bulb of the same power
25- 1 KW = 1.34 HP
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