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Sections:PhysicsChemistryBiology
Q1. [+4, -1]Physics
⚠ Negative Marking: -1 mark per wrong answer (+4 for correct, -1 for incorrect)
What is the term for the ability of a material to conduct heat?
A. Thermal conductivity
B. Thermal resistance
C. Specific heat capacity
D. Thermal energy
Correct Answer: A Thermal conductivity is the ability of a material to conduct heat. It is measured in units of watts per meter per kelvin (W/mK) and is an important property of materials in various engineering applications.
Q2. [+4, -1]Biology
What is the process by which water moves through a plant, from the roots to the leaves, and is then released into the air as water vapor?
A. Respiration
B. Photosynthesis
C. Transpiration
D. Evaporation
Correct Answer: C Transpiration is the process by which water moves through a plant, from the roots to the leaves, and is then released into the air as water vapor.
Q3. [+4, -1]Chemistry
The bond angle in water is approximately:
A. 90 degrees
B. 109.5 degrees
C. 104.5 degrees
D. 120 degrees
Correct Answer: C Water has bent shape with 104.5 degrees angle due to lone pair repulsion.
Q4. [+4, -1]Biology
What is the term for the process by which plants convert light energy into chemical energy?
A. Respiration
B. Photosynthesis
C. Decomposition
D. Fermentation
Correct Answer: B Photosynthesis is the process by which plants convert light energy into chemical energy.
Q5. [+4, -1]Physics
What is the phenomenon where an electric current generates a magnetic field?
A. Electromagnetic induction
B. Magnetic induction
C. Ampere's law
D. Faraday's law
Correct Answer: C Ampere's law states that an electric current generates a magnetic field, and the direction of the magnetic field can be determined by the right-hand rule.
Q6. [+4, -1]Biology
What is the term for the process by which water moves through a plant, from the roots to the leaves?
A. Respiration
B. Photosynthesis
C. Transpiration
D. Evaporation
Correct Answer: C Transpiration is the process by which water moves through a plant, from the roots to the leaves, and is then released into the air as water vapor. This process is an important part of the water cycle and helps to regulate the plant's temperature and maintain its water balance.
Q7. [+4, -1]Physics
The SI unit of electric potential is:
A. Coulomb
B. Ohm
C. Volt
D. Ampere
Correct Answer: C Electric potential is measured in Volts (V = J/C).
Q8. [+4, -1]Biology
What is the term for the process by which an organism's genetic information is used to synthesize proteins and other molecules in response to environmental stimuli?
A. Hereditary
B. Genetic drift
C. Gene expression
D. Cell division
Correct Answer: C Gene expression is the process by which an organism's genetic information is used to synthesize proteins and other molecules in response to environmental stimuli. This involves the transcription of DNA into RNA and the translation of RNA into protein, and is essential for the proper functioning of the organism.
Q9. [+4, -1]Chemistry
What is the type of reaction that involves the combination of two or more substances to form a new compound?
A. Synthesis reaction
B. Decomposition reaction
C. Replacement reaction
D. Combustion reaction
Correct Answer: A A synthesis reaction is a type of chemical reaction that involves the combination of two or more substances to form a new compound. This type of reaction is also known as a direct combination reaction.
Q10. [+4, -1]Chemistry
Which of the following shows paramagnetism?
A. H
B. N
C. O
D. F
Correct Answer: C O has two unpaired electrons in its MO configuration -> paramagnetic.
Q11. [+4, -1]Chemistry
What is the type of reaction that involves the breakdown of a compound into simpler substances using a catalyst?
A. Synthesis reaction
B. Decomposition reaction
C. Replacement reaction
D. Catalytic reaction
Correct Answer: D A catalytic reaction is a type of chemical reaction that involves the breakdown of a compound into simpler substances using a catalyst. The catalyst speeds up the reaction without being consumed or altered in the process.
Q12. [+4, -1]Chemistry
What is the type of bond that holds atoms together in a molecule?
A. Ionic bond
B. Covalent bond
C. Hydrogen bond
D. Van der Waals bond
Correct Answer: B A covalent bond is a type of chemical bond that holds atoms together in a molecule. It is formed when two or more atoms share one or more pairs of electrons in order to achieve a more stable electronic configuration.
Q13. [+4, -1]Physics
The threshold frequency for a metal is 5 x 10 Hz. Its work function is (h = 6.63 x 10 Js):
A. 3.315 x 10 J
B. 3.315 x 10 J
C. 6.63 x 10 J
D. 1.99 x 10 J
Correct Answer: B = hf = 6.63x10 x 5x10 = 3.315x10 J.
Q14. [+4, -1]Physics
A solid cylinder of mass M and radius R rolls without slipping on a horizontal surface with a linear velocity v. The kinetic energy of the cylinder is:
A. (1/2)Mv^2
B. (3/4)Mv^2
C. Mv^2
D. (1/4)Mv^2
Correct Answer: B The total kinetic energy (KE_total) of a body rolling without slipping is the sum of its translational kinetic energy (KE_translational) and rotational kinetic energy (KE_rotational).
KE_total = KE_translational + KE_rotational
KE_translational = (1/2)Mv^2
KE_rotational = (1/2)I^2
For a solid cylinder, the moment of inertia I = (1/2)MR^2.
For rolling without slipping, the linear velocity v and angular velocity are related by v = R, so = v/R.
Substituting these into the rotational kinetic energy equation:
KE_rotational = (1/2) * ((1/2)MR^2) * (v/R)^2
KE_rotational = (1/4)MR^2 * (v^2/R^2)
KE_rotational = (1/4)Mv^2
Now, sum the translational and rotational kinetic energies:
KE_total = (1/2)Mv^2 + (1/4)Mv^2
KE_total = (2/4)Mv^2 + (1/4)Mv^2
KE_total = (3/4)Mv^2
Q15. [+4, -1]Chemistry
What is the type of bond that occurs between two atoms with a large difference in electronegativity?
A. Covalent bond
B. Ionic bond
C. Hydrogen bond
D. Van der Waals bond
Correct Answer: B Ionic bonds occur between two atoms with a large difference in electronegativity, resulting in the transfer of electrons and the formation of ions.