Mechanics, electricity, magnetism, optics and modern physics basics.
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Q1 · Physics · EASY
A car starting from rest accelerates uniformly at 2 m/s² for 10 seconds. What is the distance covered by the car during this time?
Q2 · Physics · MEDIUM
A wire of resistance 10 ohms is stretched to twice its original length. Assuming the volume remains constant, what will be the new resistance of the wire?
Q3 · Physics · MEDIUM
A convex lens of focal length 20 cm forms an image of an object placed at 30 cm from the lens. What is the distance of the image from the lens?
Q4 · Physics · HARD
The work function of a metal is 2.5 eV. Light of wavelength 4000 Å (angstrom) is incident on the metal surface. Given that h = 6.6 × 10⁻³⁴ J·s, c = 3 × 10⁸ m/s, and 1 eV = 1.6 × 10⁻¹⁹ J, what is the maximum kinetic energy of the emitted photoelectrons?
Q5 · Physics · EASY
What is the SI unit of electric current?