Major Competitive Exams
Q. Which of the following statements is true regarding the moment of inertia?
A.
It depends on the mass distribution
B.
It is always constant
C.
It is independent of the axis of rotation
D.
It is only relevant for rigid bodies
Show solution
Solution
The moment of inertia depends on the mass distribution relative to the axis of rotation.
Correct Answer: A — It depends on the mass distribution
Learn More →
Q. Which of the following statements is true regarding the photoelectric effect?
A.
Electrons are emitted only if the light is of high intensity
B.
Electrons are emitted regardless of the frequency of light
C.
There is a threshold frequency below which no electrons are emitted
D.
The photoelectric effect can occur with any type of electromagnetic radiation
Show solution
Solution
The photoelectric effect requires a minimum threshold frequency; below this frequency, no electrons are emitted regardless of the intensity of the light.
Correct Answer: C — There is a threshold frequency below which no electrons are emitted
Learn More →
Q. Which of the following statements is true regarding the rate of a reaction?
A.
It increases with increasing temperature
B.
It decreases with increasing concentration
C.
It is constant for all reactions
D.
It is independent of the nature of reactants
Show solution
Solution
The rate of a reaction generally increases with increasing temperature.
Correct Answer: A — It increases with increasing temperature
Learn More →
Q. Which of the following statements is true regarding the rate of reaction?
A.
It is always constant
B.
It decreases with time for a reactant
C.
It increases with time for a product
D.
Both B and C
Show solution
Solution
The rate of reaction decreases with time for a reactant and increases with time for a product.
Correct Answer: D — Both B and C
Learn More →
Q. Which of the following statements is true regarding the second law of thermodynamics?
A.
It allows for the conversion of heat into work with 100% efficiency
B.
It states that energy can be created from nothing
C.
It introduces the concept of entropy
D.
It applies only to mechanical systems
Show solution
Solution
The second law of thermodynamics introduces the concept of entropy, stating that the total entropy of an isolated system can never decrease over time.
Correct Answer: C — It introduces the concept of entropy
Learn More →
Q. Which of the following statements is true regarding the use of a potentiometer?
A.
It can measure current directly
B.
It requires a galvanometer for operation
C.
It can only measure AC voltages
D.
It is not affected by the internal resistance of the source
Show solution
Solution
A potentiometer is not affected by the internal resistance of the source because it measures voltage by balancing it against a known voltage.
Correct Answer: D — It is not affected by the internal resistance of the source
Learn More →
Q. Which of the following statements is true regarding the Van der Waals equation?
A.
It accounts for the volume of gas particles.
B.
It is only applicable to ideal gases.
C.
It does not consider intermolecular forces.
D.
It is a linear equation.
Show solution
Solution
The Van der Waals equation accounts for the volume of gas particles and intermolecular forces.
Correct Answer: A — It accounts for the volume of gas particles.
Learn More →
Q. Which of the following statements is true regarding the Wheatstone bridge?
A.
It can only measure AC resistances
B.
It can measure unknown resistances
C.
It requires a power source to operate
D.
It is only used in high voltage applications
Show solution
Solution
The Wheatstone bridge is primarily used to measure unknown resistances by balancing it against known resistances.
Correct Answer: B — It can measure unknown resistances
Learn More →
Q. Which of the following statements is true regarding thermal conductivity? (2023)
A.
It is higher in gases than in solids
B.
It is a measure of a material's ability to conduct heat
C.
It increases with temperature
D.
It is independent of material properties
Show solution
Solution
Thermal conductivity is a measure of a material's ability to conduct heat; it varies with material and temperature.
Correct Answer: B — It is a measure of a material's ability to conduct heat
Learn More →
Q. Which of the following statements is true regarding total internal reflection?
A.
It occurs when light travels from a denser to a rarer medium.
B.
It occurs when light travels from a rarer to a denser medium.
C.
It can occur at any angle.
D.
It requires a prism.
Show solution
Solution
Total internal reflection occurs when light travels from a denser medium to a rarer medium.
Correct Answer: A — It occurs when light travels from a denser to a rarer medium.
Learn More →
Q. Which of the following states of matter can be compressed the most?
A.
Solid
B.
Liquid
C.
Gas
D.
Plasma
Show solution
Solution
Gases can be compressed the most due to the large spaces between particles.
Correct Answer: C — Gas
Learn More →
Q. Which of the following states of matter has a definite shape and volume?
A.
Gas
B.
Liquid
C.
Solid
D.
Plasma
Show solution
Solution
Solids have a definite shape and volume due to closely packed particles.
Correct Answer: C — Solid
Learn More →
Q. Which of the following states of matter has a definite shape?
A.
Solid
B.
Liquid
C.
Gas
D.
Plasma
Show solution
Solution
Solids have a definite shape due to closely packed particles that do not move freely.
Correct Answer: A — Solid
Learn More →
Q. Which of the following states of matter has a definite volume but no definite shape?
A.
Solid
B.
Liquid
C.
Gas
D.
Plasma
Show solution
Solution
Liquids have a definite volume but take the shape of their container.
Correct Answer: B — Liquid
Learn More →
Q. Which of the following states of matter has the highest density?
A.
Gas
B.
Liquid
C.
Solid
D.
Plasma
Show solution
Solution
Solids generally have the highest density due to closely packed particles.
Correct Answer: C — Solid
Learn More →
Q. Which of the following states of matter has the highest kinetic energy? (2022)
A.
Solid
B.
Liquid
C.
Gas
D.
Plasma
Show solution
Solution
Plasma has the highest kinetic energy as it consists of ionized gases with free-moving charged particles.
Correct Answer: D — Plasma
Learn More →
Q. Which of the following states of matter has the least amount of energy?
A.
Solid
B.
Liquid
C.
Gas
D.
Plasma
Show solution
Solution
Solids have the least amount of energy compared to liquids, gases, and plasma.
Correct Answer: A — Solid
Learn More →
Q. Which of the following states of matter has the least amount of kinetic energy?
A.
Solid
B.
Liquid
C.
Gas
D.
Plasma
Show solution
Solution
Solids have the least amount of kinetic energy as their particles are closely packed and vibrate in fixed positions.
Correct Answer: A — Solid
Learn More →
Q. Which of the following states of matter has the least intermolecular forces?
A.
Solid
B.
Liquid
C.
Gas
D.
All are equal
Show solution
Solution
Gases have the least intermolecular forces, allowing particles to move freely.
Correct Answer: C — Gas
Learn More →
Q. Which of the following structures has the highest packing efficiency? (2019)
A.
Simple cubic
B.
Body-centered cubic
C.
Face-centered cubic
D.
Hexagonal close-packed
Show solution
Solution
The face-centered cubic (FCC) structure has the highest packing efficiency of approximately 74%.
Correct Answer: C — Face-centered cubic
Learn More →
Q. Which of the following structures is responsible for the production of red blood cells? (2019)
A.
Liver
B.
Spleen
C.
Bone marrow
D.
Thymus
Show solution
Solution
Bone marrow is the primary site for the production of red blood cells in the human body.
Correct Answer: C — Bone marrow
Learn More →
Q. Which of the following substances is NOT typically found in urine? (2022)
A.
Urea
B.
Glucose
C.
Creatinine
D.
Uric acid
Show solution
Solution
Glucose is not typically found in urine unless there is a condition such as diabetes mellitus.
Correct Answer: B — Glucose
Learn More →
Q. Which of the following surfaces is the best emitter of radiation?
A.
Shiny surface
B.
Dull black surface
C.
White surface
D.
Transparent surface
Show solution
Solution
A dull black surface is the best emitter of radiation according to Kirchhoff's law of thermal radiation.
Correct Answer: B — Dull black surface
Learn More →
Q. Which of the following surfaces is the best emitter of thermal radiation?
A.
Shiny metal
B.
White paint
C.
Black paint
D.
Glass
Show solution
Solution
A black surface is the best emitter of thermal radiation due to its high emissivity.
Correct Answer: C — Black paint
Learn More →
Q. Which of the following techniques is commonly used to determine protein structure?
A.
Mass spectrometry
B.
Nuclear magnetic resonance (NMR)
C.
X-ray crystallography
D.
Both B and C
Show solution
Solution
Both nuclear magnetic resonance (NMR) and X-ray crystallography are commonly used techniques to determine the three-dimensional structure of proteins.
Correct Answer: D — Both B and C
Learn More →
Q. Which of the following techniques is commonly used to separate proteins based on their size?
A.
Chromatography
B.
Electrophoresis
C.
Spectroscopy
D.
Centrifugation
Show solution
Solution
Gel electrophoresis is a technique used to separate proteins based on their size and charge.
Correct Answer: B — Electrophoresis
Learn More →
Q. Which of the following techniques is used for the production of monoclonal antibodies? (2020)
A.
Hybridoma technology
B.
Gene editing
C.
CRISPR-Cas9
D.
Fermentation
Show solution
Solution
Hybridoma technology is used to produce monoclonal antibodies by fusing myeloma cells with specific B cells.
Correct Answer: A — Hybridoma technology
Learn More →
Q. Which of the following terms describes the physical appearance of an organism? (2023)
A.
Genotype
B.
Phenotype
C.
Allele
D.
Locus
Show solution
Solution
The term 'phenotype' refers to the physical appearance of an organism.
Correct Answer: B — Phenotype
Learn More →
Q. Which of the following transition metals can exhibit a +5 oxidation state?
A.
Vanadium
B.
Chromium
C.
Manganese
D.
Iron
Show solution
Solution
Vanadium can exhibit a +5 oxidation state in compounds like V2O5.
Correct Answer: A — Vanadium
Learn More →
Q. Which of the following transition metals can exhibit a +7 oxidation state?
A.
Manganese
B.
Iron
C.
Copper
D.
Nickel
Show solution
Solution
Manganese can exhibit a +7 oxidation state, as seen in permanganate ion (MnO4-).
Correct Answer: A — Manganese
Learn More →
Showing 12631 to 12660 of 12915 (431 Pages)