📄 All MCQs
— Page 3
25–36 of 422
A telescope uses:
💡 Explanation: A refracting telescope uses two convex lenses - an objective lens and an eyepiece lens.
According to Bohr's model electrons revolve in:
💡 Explanation: Bohr's model proposed that electrons revolve in fixed stationary circular orbits around the nucleus.
At what temperature reading do the Fahrenheit and Celsius temperature scales coincide?
💡 Explanation: The Fahrenheit and Celsius scales meet at -40 degrees (-40°C = -40°F).
The energy possessed by a body due to its motion is:
💡 Explanation: Kinetic energy is the energy an object possesses due to its motion (KE = ½mv²).
According to Rutherford's model most of the mass of an atom is concentrated in:
💡 Explanation: Rutherford's model proposed that almost all the mass of an atom is concentrated in a tiny dense nucleus.
The binary addition of two high bits (1+1) results:
💡 Explanation: In binary 1+1 = 10 (which is 2 in decimal). The result is 0 with a carry of 1.
If two similar capacitors of 4 μF each are connected in series the equivalent capacitance is:
💡 Explanation: For capacitors in series: 1/C = 1/4 + 1/4 = 2/4. Therefore C = 2 μF.
The speed of sound in air at room temperature is approximately:
💡 Explanation: The speed of sound in air at room temperature (20°C) is approximately 340 m/s.
A body of mass 0.5 kg moving with a velocity of 4 m/s has momentum equal to:
💡 Explanation: Momentum = mass × velocity = 0.5 × 4 = 2.0 Ns.
The velocity of sound is maximum in:
💡 Explanation: Sound travels fastest in solids like steel due to closely packed particles that transmit vibrations quickly.
Boyle's law states that at constant temperature:
💡 Explanation: Boyle's Law states that pressure and volume are inversely proportional at constant temperature: PV = constant.
Which of the following is the rate of change of velocity?
💡 Explanation: Acceleration is defined as the rate of change of velocity with respect to time.