General Science - MCQ Practice Questions

When object is between lens and focus (u < f), a convex lens produces virtual, erect, magnified image

The azimuthal quantum number (l) determines the shape of the orbital (s, p, d, f)

Resistance R = ρL/A. When length doubles, L becomes 2L and area becomes A/2 (volume constant). New R = ρ(2L)/(A/2) = 4ρL/A = 4R

Blue light has shorter wavelength and is scattered more by atmospheric molecules (Rayleigh scattering)

Lorentz force F = q(v × B). When v is parallel to B, the cross product is zero, so no force acts

Temperature is a scalar quantity as it has only magnitude. Displacement, velocity, and acceleration are vector quantities as they have both magnitude and direction.

Newton's Law of Universal Gravitation states F = G(m₁m₂)/r². This is the fundamental law describing gravitational attraction between masses.

1 amu = 1.66054 × 10⁻²⁷ kg. This is used to express atomic and molecular masses.

Using v = u + gt, where u = 0 (at rest), t = 2s, g = 10 m/s². Therefore v = 0 + 10 × 2 = 20 m/s.

Photosynthesis is the process where plants use sunlight, water, and CO₂ to produce glucose and oxygen. The equation is 6CO₂ + 6H₂O + light → C₆H₁₂O₆ + 6O₂.

Pure water at 25°C has a pH of 7, which is neutral. This is because [H⁺] = [OH⁻] = 10⁻⁷ M, making pH = -log(10⁻⁷) = 7.

First convert 72 km/h = 20 m/s. Using v = u + at: 0 = 20 + a(8), so a = -$\frac{20}{8}$ = -2.5 m/s². Magnitude of deceleration is 2.5 m/s².

Chlorine (Cl) has atomic number 17, with electronic configuration 2, 8, 7 (K-shell: 2, L-shell: 8, M-shell: 7).

Refractive index n = c/v. Therefore, v = c/n = (3 × 10⁸)/1.5 = 2 × 10⁸ m/s.

Elastic potential energy U = ½kx². U = ½ × 100 × (0.2)² = 50 × 0.04 = 2 J.

Insulin, produced by the pancreas, lowers blood glucose by facilitating glucose uptake into cells. Glucagon raises blood glucose levels.

Work by gravity W = -mgh (negative because displacement is opposite to force direction). W = -5 × 10 × 10 = -500 J.

For parallel connection: 1/R = $\frac{1}{6}$ + $\frac{1}{3}$ + $\frac{1}{2}$ = $\frac{1}{6}$ + $\frac{2}{6}$ + $\frac{3}{6}$ = $\frac{6}{6}$ = 1. Therefore R = 1Ω.

Ferromagnetism is the property of materials like iron, cobalt, and nickel to retain permanent magnetic properties due to aligned electron spins.

Vertical component of velocity: u_y = 20 sin(45°) = 20/√2 = 10√2 m/s. Maximum height h = u_y²/(2g) = (10√2)²/(2×10) = $\frac{200}{20}$ = 10 m.