Practice Pakistan's most useful MCQs for competitive exams

Increase in atomic number is observed during_________________?

• (A)  Alpha emission
• (B)  Beta emission
• (C)  Both A & B
• (D)  Radioactivity

Answer

Submitted By :Ali Uppal

The number of fundamental particles in an atom of the lightest isotope carbon are_______________?

• (A)  6
• (B)  12
• (C)  18
• (D)  20

Answer

Submitted By :Ali Uppal

Atom cannot be divided into simple unitstheorized by________________?

• (A)  Rutherford
• (B)  Dalton
• (C)  Bohr
• (D)  Schrodinger

Answer

Submitted By :Ali Uppal

A technique of partition chromatography in which the solvent is in a pool at the bottom of container_______________?

• (A)  Adsorption chromatography
• (B)  Ascending chromatography
• (C)  Radial chromatography
• (D)  Descending chromatography

Answer

Submitted By :Ali Uppal

A substance having very high vapour pressure at its melting point on heating will show_______________?

• (A)  Melting
• (B)  Sublimation
• (C)  Decomposition
• (D)  Condensation

Answer

Submitted By :Ali Uppal

Fluted filter paper is used to__________________?

• (A)  Filter hot solution
• (B)  Avoid premature crystallization
• (C)  Increase the rate of filtration
• (D)  Decrease the area

Answer

Submitted By :Ali Uppal

Which of the following technique is used for the separation of insoluble particles from liquids ?

• (A)  Filtration
• (B)  Crystallization
• (C)  Solvent extraction
• (D)  Chromatography

Answer

Submitted By :Ali Uppal

Which of the following way in used for classification of chromatography ?

• (A)  Shape
• (B)  Phase
• (C)  Mechanism
• (D)  All

Answer

Submitted By :Ali Uppal

Neutrons moving with an energy of 1.2 MeV are called_______________?

• (A)  Fast neutrons
• (B)  Slow neutrons
• (C)  Moderate neutrons
• (D)  All are possible

Answer

Submitted By :Ali Uppal

When 6d orbital is complete the entering electron goes into_________________?

• (A)  7f
• (B)  7s
• (C)  7p
• (D)  7d

Answer

Submitted By :Ali Uppal