Questions (120)
Q1GEO2025
An electromagnetic wave with its magnetic field B = 0.3cos(8y - 10^8 t) ĵ tesla is propagating in a non-magnetic dielectric medium of refractive index 2. The wavelength of the wave is
- A 6π m
- B 3π m ✓
- C 0.3 m
- D (2π/3) m
✓ Correct answer: (B)
Science & Technology › Physics & Chemistry
Q2GEO2025
A spherical conductor of radius a has a cavity of radius b at its centre such that a > b. A positive charge q is placed at its centre (see in the figure). The electric fields in the regions b < r < a and r > a are respectively
- A q/(4πε₀a²) inward and q/(4πε₀b²) outward
- B q/(4πε₀b²) inward and zero
- C zero and q/(4πε₀r²) outward ✓
- D zero and zero
✓ Correct answer: (C)
Science & Technology › Physics & Chemistry
Q3GEO2025
For a given system of resistors having resistances R, 2R, R₀ and 2R (shown in the figure), what will be the value of resistance of the resistor R₀, when there is NO current in the galvanometer G?
- A R₀ = 0
- B R₀ = R
- C R₀ = 2R
- D R₀ = 4R ✓
✓ Correct answer: (D)
Science & Technology › Physics & Chemistry
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