Which of the following is used in water purification?
A crescograph is a device for measuring the growth in __________?
__________ is a strong smelling agent added to LPG cylinders to detect leakage?
Which instrument is used for viewing the sun?
The heaviest man made element found so for is__________?
The heaviest naturally-occurring element is_________?
Which organ is considered as chemical factory of human body ?
Transistors do not need a warm up period because they have no ?
Involuntary muscles in a human body are present in__________?
Which of the following has not involuntary muscles?
Tyndall effect is related to the ______ of light?
______ is the “Work done in moving a unit charge between two points in an electric circuit”?
The contraction and expansion of the movement of the walls of the food pipe after entering the slightly digested food is known as ______ movement
The process of splitting water molecules in the presence of light energy is called_________?
______ soil is also called Regur soil?
A Rhinoscope (or Nasoscope) is a thin, tube-like instrument used to examine the inside of the_____?
What is Melioidosis?
The Study of human beauty is called__________?
Which of the following bonds are weakest in nature?
The most suitable unit for expressing nuclear radius is_______?
Name the Scientist who stated that matter can be converted into energy?
Which has the lowest pH?
The photo-receptors in the eye are present in__________?
The turning effect of force is called_________?
Which law states that the rate of the effusion of a gas is inversely proportional to the square root of its density?
Which law states that the volume of a given amount of gas held at constant pressure is directly proportional to the Kelvin temperature?
By which process does the smell of cooking spread to all the rooms in a house?
Which of the following waves have smallest velocity in vacuum?
Which law states that “equal volumes of all gases, at the same temperature and pressure, have the same number of molecules?
Which of the following noble gases is abundant in air?
Which of the following noble gases is not present in atmosphere?
The movement of any solvent across a semipermeable membrane is called__________?
The process whereby energy is dissipated from the oscillating system is called__________?
Internal friction of fluid is called_________?
What is the name of the gas used in an air conditioner?
What is the one of the other name of Vitamin “A”?
Which of the following gland has shape of butterfly?
Another name of vitamin C is__________?
Which of following is the smallest endocrine gland in the human body?
Which gas is used to extinguish fire?
__________ gas is released when coal is burnes in ln lack of Oxygen?
Fan was invented by__________?
According to which law gas is directly proportional to temperature?
Who said that light is made of corpuscles/particles?
Who discovered blood circulation?
Who invented steamboat?
Other name of white blood cells is __________?
Other name of platelets _______?
Other name of red blood cells is __________?
Albert Einstein was a__________?
Bubo bubo is the scientific name of which of the following species?

lightest metal is__________?

A. Lithium
B. Sodium
C. Magnesium
D. Aluminium

Submitted by: Junaid Amjad

The lightest or least dense metal that is a pure element is lithium, which has a density of 0.534 g/cm3. This makes lithium nearly half as dense as water, so if lithium was not so reactive, a chunk of the metal would float on water.

Correct Answer: Lithium ✔

Last Updated: December 12, 2019