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Sections:PhysicsChemistryBiology
Q1. [+4, -1]Physics
⚠ Negative Marking: -1 mark per wrong answer (+4 for correct, -1 for incorrect)
If the speed of light is 3 × 108 m/s, the distance traveled by light in one year (light year) is approximately:
A. 9.46 × 10¹² km
B. 9.46 × 10¹² km
C. 9.46 × 10¹5 km
D. 3 × 108 km
Correct Answer: B 1 light year = 9.46 × 10¹² km.
Q2. [+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 × t = 10 × 5 = 50 Ns.
Q3. [+4, -1]Physics
The internal resistance of an ideal voltmeter is:
A. Zero
B. Low
C. Infinity
D. 1 O
Correct Answer: C Ideal voltmeter has infinite resistance to draw zero current.
Q4. [+4, -1]Physics
The phenomenon of splitting of light into its constituent colors is called:
A. Reflection
B. Refraction
C. Dispersion
D. Diffraction
Correct Answer: C Dispersion splits white light into VIBGYOR colors (e.g., rainbow).
Q5. [+4, -1]Physics
Which law states that entropy of an isolated system always increases?
A. First law
B. Second law
C. Third law
D. Zeroth law
Correct Answer: B Second law: entropy of isolated system always increases (?S = 0).
Q6. [+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 = 2pv(L/g). Time period depends only on length and g.
Q7. [+4, -1]Physics
The magnetic field at the center of a current carrying circular loop is:
A. Zero
B. µ0I/2R
C. µ0I/R
D. µ0I/4pR
Correct Answer: B B = µ0I/(2R) at center of circular loop.
Q8. [+4, -1]Physics
The threshold frequency for a metal is 5 × 10¹4 Hz. Its work function is (h = 6.63 × 10?³4 Js):
A. 3.315 × 10?¹? J
B. 3.315 × 10?¹? J
C. 6.63 × 10?¹? J
D. 1.99 × 10?¹? J
Correct Answer: B f = hf0 = 6.63×10?³4 × 5×10¹4 = 3.315×10?¹? J.
Q9. [+4, -1]Physics
The direction of induced current is given by:
A. Ampere's law
B. Biot-Savart law
C. Lenz's law
D. Ohm's law
Correct Answer: C Lenz's law determines direction: induced current opposes change in flux.
Q10. [+4, -1]Physics
Radioactive decay follows which order of kinetics?
A. Zero order
B. First order
C. Second order
D. Third order
Correct Answer: B Radioactive decay follows first order kinetics: N = N0e???.
Q11. [+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).
Q12. [+4, -1]Chemistry
The most stable allotrope of carbon is:
A. Diamond
B. Graphite
C. Fullerene
D. Coal
Correct Answer: B Graphite is the most stable allotrope of carbon at room temperature.
Q13. [+4, -1]Chemistry
Which of these is an example of an aromatic compound?
A. Cyclohexane
B. Benzene
C. Cyclohexene
D. 1,3-cyclohexadiene
Correct Answer: B Benzene (C6H6) is aromatic with delocalized 6p electrons.
Q14. [+4, -1]Chemistry
The process of electrolysis is based on:
A. Chemical effect of current
B. Magnetic effect of current
C. Redox reactions
D. Heating effect
Correct Answer: C Electrolysis involves redox reactions at electrodes driven by electric current.
Q15. [+4, -1]Chemistry
Which of the following is a saturated hydrocarbon?
A. C2H4
B. C3H8
C. C2H2
D. C6H6
Correct Answer: B Propane (C3H8) follows C?H2??2 ? saturated alkane.
Q16. [+4, -1]Chemistry
The oxide that turns red litmus blue is:
A. CO2
B. SO2
C. Na2O
D. P2O5
Correct Answer: C Na2O is basic oxide ? turns red litmus blue. CO2, SO2, P2O5 are acidic.
Q17. [+4, -1]Chemistry
The number of atoms in 1 mole of any substance is: