Practice Pakistan's most useful MCQs for competitive exams

In a group, atomic radii increase due to successive increase of _________ ?

• (A)  Electronic shells
• (B)  Proton shells
• (C)  Neutron shells
• (D)  Nucleus

Answer

Submitted By :Ali Uppal

Chromatography is used to separate _________ ?

• (A)  Solution
• (B)  Mixtures
• (C)  Molecules
• (D)  Atoms

Answer

Submitted By :Ali Uppal

In SI base units, 1 Bq is equal to __________ ?

• (A)  10 disintegration per second
• (B)  1.5 disintegration per second
• (C)  0.01 disintegration per second
• (D)  1 disintegration per second

Answer

Submitted By :Ali Uppal

A helium nucleus comprising of two protons and two neutrons with a charge of 2e is _________ ?

• (A)  Beta particle
• (B)  Gamma particle
• (C)  Alpha particle
• (D)  Negative particle

Answer

Submitted By :Ali Uppal

Elements which emit natural radioactivity are known as __________ ?

• (A)  Radio elements
• (B)  Active elements
• (C)  Radioactive elements
• (D)  Nuclear elements

Answer

Submitted By :Ali Uppal

When Ammonia is used as a refrigerant in vapour compression cycle?

• (A)  Cu Tubing used
• (B)  Steel tubes used
• (C)  Both a & b
• (D)  Material does not effect by refrigerant

Answer

Submitted By :Ali Uppal

Example of ‘globular’ proteins is __________ ?

• (A)   Peptide
• (B)  Enzymes
• (C)  Primary protein
• (D)  Secondary proteins

Answer

Submitted By :Ali Uppal

which Compound Destroy The OZONE ?

• (A)  CFCs
• (B)  CH3COOH
• (C)  BOTH A & B
• (D)  None Of These

Answer

Submitted By :Ali Uppal

In whole Periodic Table which element Is Most Reducing Agent ?

• (A)  Chlorine
• (B)  lithium
• (C)  Helium
• (D)  Neon

Answer

Submitted By :Ali Uppal

When body is in motion, ____________ always changes?

• (A)  its velocity
• (B)  its acceleration
• (C)  its position vector
• (D)  its momentum

Answer

Submitted By :Ali Uppal