A 4.5 x 10^8 m/s
B 3 x 10^8 m/s
C 1.5 x 10^8 m/s
D 2 x 10^8 m/s
Explanation: v = c/n = 3x10^8/1.5 = 2x10^8 m/s.
A Violet
B Green
C Red
D Blue
Explanation: Red light has the longest wavelength (~700 nm) in visible light.
A 90 degrees
B 60 degrees
C 30 degrees
D 42 degrees
Explanation: Critical angle = sin-1(1/1.5) = 41.8 degrees.
A Reflection
B Refraction
C Scattering
D Diffraction
Explanation: Solar radiation pressure pushes the comet\'s tail away from the Sun.
A Beyond 2F
B At 2F
C Between F and lens
D Beyond F
Explanation: Convex lens forms virtual enlarged image between F and the lens.
A 1/f = 1/v - 1/u
B f = u + v
C 1/f = u/v
D 1/f = 1/v + 1/u
Explanation: Lens formula: 1/f = 1/v + 1/u.
A Only real images
B Only virtual images
C Both real and virtual images
D Neither
Explanation: Concave mirrors form both real and virtual images.
A 2 D
B 0.25 D
C 25 D
D 4 D
Explanation: P = 1/f = 1/0.25 = 4 diopters.
A Convex lens
B Bifocal lens
C Cylindrical lens
D Concave lens
Explanation: Myopia is corrected with a concave diverging lens.
A Reflection
B Diffraction
C Polarization
D Interference
Explanation: Young\'s experiment proves wave nature of light through interference.
A lambda D/d
B lambda d/D
C Dd/lambda
D lambda D d
Explanation: Fringe width = lambda D/d where D is screen distance, d is slit separation.
A Longitudinal wave
B Sound wave
C Stationary wave
D Transverse wave
Explanation: Only transverse waves can be polarized.
A Focal length only
B Wavelength of light
C Aperture of lens
D Both B and C
Explanation: Resolving power depends on wavelength and numerical aperture.
A Concave
B Parabolic
C Plane
D Convex
Explanation: Convex mirrors provide a wider field of view.
A V = IR
B V = I/R
C V = I2R
D V = IR2
Explanation: Ohm\'s Law: voltage equals current times resistance.
A Volt
B Watt
C Ohm
D Ampere
Explanation: Ampere (A) is the SI unit of electric current.
A Cross-sectional area
B Voltage
C Current
D Length
Explanation: R = rho L/A, directly proportional to length.
A 8 ohm
B 1 ohm
C 4 ohm
D 2 ohm
Explanation: Req = R/n = 4/2 = 2 ohm for equal resistors in parallel.
A Watt
B Ampere
C Volt
D Joule
Explanation: Energy is measured in Joules.
A Different
B Infinite
C Zero
D Same
Explanation: Same current flows through all components in series.