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Sections:PhysicsChemistryBiology
Q1. [+4, -1]Biology
⚠ Negative Marking: -1 mark per wrong answer (+4 for correct, -1 for incorrect)
Which disease is caused by a virus?
A. Cholera
B. Typhoid
C. AIDS
D. Malaria
Correct Answer: C AIDS is caused by HIV (virus). Cholera/typhoid: bacteria, Malaria: protozoa.
Q2. [+4, -1]Biology
The enzyme that breaks down proteins in stomach is:
A. Amylase
B. Pepsin
C. Lipase
D. Trypsin
Correct Answer: B Pepsin (in gastric juice) breaks proteins into peptides in acidic medium.
Q3. [+4, -1]Chemistry
What is the type of reaction that involves the loss of electrons by a species?
A. Oxidation reaction
B. Reduction reaction
C. Acid-base reaction
D. Neutralization reaction
Correct Answer: A An oxidation reaction is a type of reaction that involves the loss of electrons by a species.
Q4. [+4, -1]Physics
The coefficient of performance of a refrigerator is given by:
A. Q/W
B. Q/W
C. W/Q
D. (Q-Q)/W
Correct Answer: B COP = Q/W where Q is heat extracted from cold reservoir and W is work input.
Q5. [+4, -1]Physics
The time period of a simple pendulum depends on:
A. Mass of bob
B. Amplitude (small)
C. Length of pendulum
D. Material of bob
Correct Answer: C T = 2pisqrt(L/g). Time period depends only on length and g.
Q6. [+4, -1]Physics
Which of the following has the highest specific heat capacity?
A. Iron
B. Copper
C. Water
D. Lead
Correct Answer: C Water has the highest specific heat capacity (4200 J/kg degrees C) among common substances.
Q7. [+4, -1]Physics
What is the nature of the force between two parallel current-carrying conductors?
A. Repulsive
B. Attractive
C. Both attractive and repulsive
D. Neutral
Correct Answer: C The force between two parallel current-carrying conductors can be either attractive or repulsive, depending on the direction of the current flow.
Q8. [+4, -1]Biology
DNA replication is which type of process?
A. Conservative
B. Semiconservative
C. Dispersive
D. Random
Correct Answer: B DNA replication follows the semiconservative model as demonstrated by Meselson and Stahl.
Q9. [+4, -1]Chemistry
Which quantum number determines the shape of orbital?
A. n
B. l
C. m
D. s
Correct Answer: B Azimuthal quantum number (l) determines orbital shape (s->0, p->1, d->2).
Q10. [+4, -1]Chemistry
The chemical formula of rust is:
A. FeO
B. FeO
C. FeO.xHO
D. FeO
Correct Answer: C Rust is hydrated iron(III) oxide, FeO.xHO.
Q11. [+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.
Q12. [+4, -1]Physics
The dimensional formula of force is:
A. [MLT]
B. [MLT^2]
C. [MLT^2]
D. [ML^2T^2]
Correct Answer: C F = ma -> [F] = [M][LT^2] = [MLT^2].
Q13. [+4, -1]Physics
What is the phenomenon where an electric current is generated in a conductor when it is exposed to a changing magnetic field?
A. Electromagnetic induction
B. Electrostatic induction
C. Magnetic induction
D. Electric induction
Correct Answer: A Electromagnetic induction is the phenomenon where an electric current is generated in a conductor when it is exposed to a changing magnetic field.
Q14. [+4, -1]Physics
When light of frequency is incident on a photocathode, the stopping potential is V. When light of frequency is incident on the same photocathode, the stopping potential is V. If V > V, which of the following relations is correct? (h is Planck's constant, e is the charge of an electron)
A. h( - ) = e(V - V)
B. h( - ) = e(V - V)
C. h( + ) = e(V + V)
D. h( / ) = e(V / V)
Correct Answer: A According to Einstein's photoelectric equation, the maximum kinetic energy of emitted photoelectrons (KE_max) is given by:h = + KE_maxwhere h is Planck's constant, is the frequency of incident light, and is the work function of the metal.The stopping potential (V_s) is related to KE_max by: KE_max = eV_sSo, the equation becomes: h = + eV_sFor the first case:h = + eV (Equation 1)For the second case:h = + eV (Equation 2)Subtract Equation 1 from Equation 2:(h - h) = ( + eV) - ( + eV)h( - ) = eV - eVh( - ) = e(V - V)
Q15. [+4, -1]Physics
A force of 10 N acts on a body of mass 2 kg for 5 s. The impulse is:
A. 10 Ns
B. 50 Ns
C. 2 Ns
D. 25 Ns
Correct Answer: B Impulse = F x t = 10 x 5 = 50 Ns.