Q. What is the primary cause of viscosity in fluids?
A.
Molecular interactions
B.
Temperature
C.
Pressure
D.
Density
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Solution
Viscosity arises primarily from molecular interactions within the fluid, which resist flow.
Correct Answer: A — Molecular interactions
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Q. What is the primary characteristic of liquids that distinguishes them from solids?
A.
Definite shape
B.
Definite volume
C.
Incompressibility
D.
Fluidity
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Solution
Liquids have fluidity, allowing them to flow and take the shape of their container.
Correct Answer: D — Fluidity
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Q. What is the primary charge carrier in n-type semiconductors?
A.
Holes
B.
Electrons
C.
Protons
D.
Neutrons
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Solution
In n-type semiconductors, electrons are the majority charge carriers due to the addition of donor impurities.
Correct Answer: B — Electrons
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Q. What is the primary charge carrier in P-type semiconductors?
A.
Electrons
B.
Holes
C.
Protons
D.
Neutrons
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Solution
In P-type semiconductors, holes are the primary charge carriers.
Correct Answer: B — Holes
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Q. What is the primary driving force for adsorption in physisorption?
A.
Chemical bonds
B.
Van der Waals forces
C.
Hydrogen bonds
D.
Ionic interactions
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Solution
Physisorption is primarily driven by weak van der Waals forces.
Correct Answer: B — Van der Waals forces
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Q. What is the primary effect of a -CN group on a benzene ring?
A.
+M effect
B.
-M effect
C.
+I effect
D.
-I effect
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Solution
-CN exhibits a -M effect as it withdraws electron density through resonance.
Correct Answer: B — -M effect
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Q. What is the primary effect of the -COOH group on a benzene ring?
A.
+M effect
B.
-M effect
C.
+I effect
D.
-I effect
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Solution
The -COOH group primarily exhibits a -M effect as it withdraws electron density through resonance.
Correct Answer: B — -M effect
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Q. What is the primary effect of the -COOH group on aromatic compounds?
A.
+M effect
B.
-M effect
C.
+I effect
D.
-I effect
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Solution
-COOH exhibits a -M effect as it withdraws electron density through resonance.
Correct Answer: B — -M effect
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Q. What is the primary effect of the inductive effect in organic compounds?
A.
Stabilization of positive charge
B.
Stabilization of negative charge
C.
Delocalization of electrons
D.
Formation of hydrogen bonds
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Solution
The inductive effect involves the shifting of electron density through sigma bonds, which stabilizes positive charges.
Correct Answer: A — Stabilization of positive charge
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Q. What is the primary effect of the inductive effect in organic molecules?
A.
Stabilization of positive charge
B.
Stabilization of negative charge
C.
Delocalization of electrons
D.
Formation of hydrogen bonds
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Solution
The inductive effect involves the shifting of electron density through sigma bonds, which can stabilize positive charges.
Correct Answer: A — Stabilization of positive charge
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Q. What is the primary factor affecting colligative properties?
A.
Nature of solute
B.
Concentration of solute
C.
Temperature
D.
Volume of solvent
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Solution
Colligative properties depend primarily on the concentration of solute particles in a solution.
Correct Answer: B — Concentration of solute
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Q. What is the primary factor affecting the rate of heat transfer by conduction?
A.
Surface area
B.
Temperature difference
C.
Material properties
D.
All of the above
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Solution
All of the above factors affect the rate of heat transfer by conduction.
Correct Answer: D — All of the above
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Q. What is the primary factor that affects the rate of a chemical reaction?
A.
Concentration
B.
Temperature
C.
Catalyst
D.
All of the above
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Solution
All of the above factors affect the rate of a chemical reaction.
Correct Answer: D — All of the above
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Q. What is the primary factor that affects the rate of adsorption of a gas on a solid surface?
A.
Temperature
B.
Pressure
C.
Surface area of the adsorbent
D.
Nature of the gas
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Solution
The rate of adsorption is primarily affected by the surface area of the adsorbent, as a larger surface area provides more sites for adsorption.
Correct Answer: C — Surface area of the adsorbent
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Q. What is the primary factor that affects the state of matter of a substance?
A.
Temperature
B.
Color
C.
Mass
D.
Volume
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Solution
Temperature is the primary factor that affects the state of matter by influencing kinetic energy.
Correct Answer: A — Temperature
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Q. What is the primary factor that affects the viscosity of a gas?
A.
Temperature
B.
Pressure
C.
Density
D.
Molecular weight
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Solution
The viscosity of a gas is primarily affected by temperature; as temperature increases, viscosity also increases.
Correct Answer: A — Temperature
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Q. What is the primary factor that determines the color of coordination compounds?
A.
Nature of the metal ion
B.
Nature of the ligands
C.
Geometry of the complex
D.
All of the above
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Solution
The color of coordination compounds is influenced by the metal ion, ligands, and geometry, affecting d-d transitions.
Correct Answer: D — All of the above
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Q. What is the primary factor that determines the viscosity of a fluid?
A.
Temperature
B.
Pressure
C.
Density
D.
Molecular size
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Solution
Viscosity is primarily affected by temperature; as temperature increases, viscosity generally decreases.
Correct Answer: A — Temperature
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Q. What is the primary force acting on a satellite in a stable orbit around the Earth?
A.
Gravitational force
B.
Electromagnetic force
C.
Frictional force
D.
Centrifugal force
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Solution
A satellite in a stable orbit is primarily influenced by the gravitational force exerted by the Earth.
Correct Answer: A — Gravitational force
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Q. What is the primary force that holds the nucleus of an atom together?
A.
Electromagnetic force
B.
Gravitational force
C.
Strong nuclear force
D.
Weak nuclear force
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Solution
The strong nuclear force is the primary force that holds protons and neutrons together in the nucleus.
Correct Answer: C — Strong nuclear force
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Q. What is the primary force that holds the nucleus together?
A.
Electromagnetic force
B.
Gravitational force
C.
Strong nuclear force
D.
Weak nuclear force
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Solution
The strong nuclear force is the primary force that holds the protons and neutrons together in the nucleus.
Correct Answer: C — Strong nuclear force
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Q. What is the primary force that holds the protons and neutrons together in the nucleus?
A.
Electromagnetic force
B.
Gravitational force
C.
Strong nuclear force
D.
Weak nuclear force
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Solution
The strong nuclear force is the primary force that holds protons and neutrons together in the nucleus, overcoming the electromagnetic repulsion between protons.
Correct Answer: C — Strong nuclear force
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Q. What is the primary function of a cathode in an electrochemical cell?
A.
To oxidize species
B.
To reduce species
C.
To provide electrons
D.
To balance charge
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Solution
The cathode is where reduction occurs, gaining electrons in the process.
Correct Answer: B — To reduce species
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Q. What is the primary function of a diode in a circuit?
A.
Amplification
B.
Rectification
C.
Capacitance
D.
Inductance
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Solution
The primary function of a diode is rectification, allowing current to flow in one direction only.
Correct Answer: B — Rectification
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Q. What is the primary function of a modulator in a communication system?
A.
To amplify the signal
B.
To convert the signal into a suitable form for transmission
C.
To demodulate the received signal
D.
To filter out noise
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Solution
A modulator converts the baseband signal into a form suitable for transmission over a communication channel.
Correct Answer: B — To convert the signal into a suitable form for transmission
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Q. What is the primary function of a salt bridge in a galvanic cell?
A.
To provide a path for electrons
B.
To maintain charge balance
C.
To increase voltage
D.
To decrease resistance
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Solution
The primary function of a salt bridge is to maintain charge balance by allowing ions to flow between the half-cells.
Correct Answer: B — To maintain charge balance
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Q. What is the primary function of a transistor in semiconductor technology?
A.
Switching
B.
Storage
C.
Transmission
D.
Resistance
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Solution
The primary function of a transistor is switching, allowing it to control electrical signals.
Correct Answer: A — Switching
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Q. What is the primary function of a transistor?
A.
Rectification
B.
Amplification
C.
Capacitance
D.
Inductance
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Solution
The primary function of a transistor is amplification of electrical signals.
Correct Answer: B — Amplification
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Q. What is the primary function of a transponder in satellite communication?
A.
To amplify the signal
B.
To receive and retransmit signals
C.
To modulate the signal
D.
To filter out noise
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Solution
A transponder in satellite communication receives signals from the ground, processes them, and retransmits them back to Earth.
Correct Answer: B — To receive and retransmit signals
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Q. What is the primary function of an antenna in a communication system?
A.
To amplify the signal
B.
To convert electrical signals into electromagnetic waves
C.
To modulate the signal
D.
To demodulate the signal
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Solution
An antenna converts electrical signals into electromagnetic waves for transmission and vice versa for reception.
Correct Answer: B — To convert electrical signals into electromagnetic waves
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