Rising of a wetting liquid in a capillary tube is due to__________________?
A. Surface tension
B. Cohesive forces
C. Adhesive forces
D. viscosity
Submitted by :- Jamil Ahmed
When water freezes at 0°C its density decreases due to_______________?
A. Change of bond angles
B. Cubic structure of ice
C. Empty space present in the structure of ice
D. Change of bond length
Submitted by :- Jamil Ahmed
The conversion of vapours back into their liquid state is called__________________?
A. crystallization
B. evaporization
C. vaporization
D. condensation
Submitted by :- Jamil Ahmed
Steam causes more sever burn than the boiling water because it possesses _________________?
A. Latent heat of fusion
B. Latent heat of vaporization
C. Latent heat of sublimation
D. All of the above
Submitted by :- Jamil Ahmed
The density of water may be__________________?
A. Equal to that of ice
B. Greater than that of ice
C. Less than that of ice
D. All are possible
Submitted by :- Jamil Ahmed
The magnetic quantum number (QN) has its values determined directly by the value of_______________?
A. Principal (QN)
B. Azimuthal (QN)
C. Spin (QN)
D. Both A & B
Submitted by :- Jamil Ahmed
All of the following were theorized by Bohr in his description of the atom except__________________?
A. Angular momentum of electrons in multiples of h/2?
B. Electrons revolve in discrete circular orbits
C. Energy of each electron is directly proportional to n2
D. Electrons radiate energy continuously in a given orbit.
Submitted by :- Jamil Ahmed
The amount of heat absorbed when one mole of a liquid is changed into gas at its boiling point is_____________________?
A. Molar heat of sublimation
B. Molar heat of fusion
C. Molar heat of vapourization
D. Latent heat of that liquid
Submitted by :- Jamil Ahmed
If a physical and chemical change takes place at a constant pressure then the heat change during the process is called__________________?
A. Heat of transition
B. Heat of fusion
C. Enthalpy change
D. All of above
Submitted by :- Jamil Ahmed
Which solids are called true solids _______________?
A. Metallic
B. Amorphous
C. Crystalline
D. Vitreous
Submitted by :- Jamil Ahmed