A Non-uniform
B Zero
C Uniform
D Maximum at ends
Explanation: Inside a long solenoid, the magnetic field is uniform and parallel to the axis.
A 50 Hz
B 60 Hz
C 100 Hz
D 25 Hz
Explanation: The standard frequency of AC power supply in India is 50 Hz.
A 2/5 MR²
B 2/3 MR²
C MR²
D 7/5 MR²
Explanation: The moment of inertia of a solid sphere about its diameter is 2/5 MR²
A Net force is zero
B Net torque is zero
C Net work is zero
D Net energy is zero
Explanation: Angular momentum is conserved when the net external torque acting on the system is zero.
A g(1 + 2h/R)
B g(1 - 2h/R)
C g(1 + h/R)
D g
Explanation: g\' = g(R/(R+h))² ≈ g(1 - 2h/R) for h << R
A 40 m
B 60 m
C 80 m
D 90 m
Explanation: t = √(2h/g) = √(90/10) = 3 s. Range = uₓt = 20 × 3 = 60 m
A Greater than 1
B Less than the coefficient of static friction
C Equal to the coefficient of static friction
D Zero
Explanation: Kinetic friction is always less than static friction for the same pair of surfaces.
A Linear momentum
B Angular momentum
C Kinetic energy
D Force
Explanation: Torque = dL/dt, where L is angular momentum. This is analogous to F = dp/dt.
A nλ
B (n + ½)λ
C 2nλ
D nλ/2
Explanation: Destructive interference occurs when path difference = (n + ½)λ, where the waves are out of phase.
A At focus
B At infinity
C At center of curvature
D Between F and C
Explanation: When an object is at C of a concave mirror, the image is also formed at C, real and inverted, same size.
A Doubles
B Increases by √2 times
C Remains same
D Halves
Explanation: KE = p²/2m → p = √(2mKE). If KE doubles, p becomes √2 times the original.
A Violet
B Green
C Red
D Blue
Explanation: Red light has the longest wavelength (~700 nm) in the visible spectrum.
A Volt
B Watt
C Ampere
D Coulomb
Explanation: Ampere (A) is the SI base unit of electric current.
A Straight line
B Helical path
C Circular path
D Elliptical path
Explanation: A charged particle entering a magnetic field perpendicularly experiences a force perpendicular to both v and B, causing circular motion.
A Electric field
B Electric flux
C Electric potential
D Capacitance
Explanation: Electric potential at a point is defined as the work done in bringing a unit positive charge from infinity to that point.
Explanation: Energy stored in a capacitor = ½CV² = ½Q²/C = ½QV
A Static electricity
B Electromagnetic induction
C Ohm\'s law
D Coulomb\'s law
Explanation: A transformer works on the principle of mutual electromagnetic induction between primary and secondary coils.
A Very high
B Zero
C Negative
D Infinite
Explanation: A superconductor has exactly zero electrical resistance below its critical temperature.
Explanation: Each part has resistance R/n. In parallel: 1/Req = n/(R/n) = n²/R → Req = R/n²
A Mass
B Velocity
C Charge
D Energy
Explanation: λ = h/mv, so the de Broglie wavelength is inversely proportional to the velocity (momentum) of the particle.