Basics of Chemistry

In a carnot cycle, the working medium receives heat at a temperature.

• Lower

• Higher

• Constant

• None

A process becomes reversible when

• All the points through the path are at thermodynamic equilibrium

• It undergoes in the absence of any dissipative effect

• It undergoes as a very slow quasi-static process

• All above

What are the 3 particles that make-up the atom?

• protons, neutrons, and isotopes

• neutrons, isotopes, and electrons

• positives, negatives, and electrons

• protons, neutrons, and electrons

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These are pure substances that cannot be broken down further into other chemical substances. 

• Elements
• Atoms
• Protons
• Electrons

These carry a positive charge.

• Protons
• Electrons
• Neutrons
• Quarks

What takes place when a solid changes to a liquid?

• condensation
• freezing
• melting
• evaporation

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NGSS.MS-PS1-4

NGSS.MS-PS3-4

The number of atoms per unit cell in simple, fcc and bcc unit cells are

• 1, 4, 2

• 1, 2, 4

• 2, 1, 4

• 2, 4, 1

The packing efficiency in simple, fcc, bcc unit cells will be respectively

• 74% 52.4% 68%

• 52.4% 68% 74%

• 68% 74% 52.4%

• 52.4% 74% 68%

Your favourite branch of chemistry is

• Physical Chemistry

• Organice Chemistry

• Inorganic Chemistry

• Analytical Chemistry