May 25, 2024

Science Quiz: Day: 100

Which of the following causes adiabatic temperature changes in atmosphere?
  • (A) Deflection and advection
  • (B) Latent heat of condensation
  • (C) Expansion and compression of the air
  • (D) Partial absorption of solar
Sound waves cannot travel through a
  • (A) Copper wire placed in air
  • (B) Silver slab placed in air
  • (C) Glass prism placed in water
  • (D) Wooden hollow pipe placed in vacuum
Which of the following statements is/are correct?
1. There is no net moment on a body which is in equilibrium
2.The momentum of a body is always conserved
3.The kinetic energy of an object is always conserved
  • (A) 1, 2 and 3
  • (B) Both 2 and 3
  • (C) Both 1 and 2
  • (D) Only 1
Working of safety fuses depends upon
1. Magnetic effect of the current
2. Chemical effect of the current
3. Magnitude of the current
4. Heating effect of the current
  • (A) 1,2,3 and 4
  • (B) 1,2 and 3
  • (C) Both 3 and 4
  • (D) Only 4
The frequency of ultrasound waves is:
  • (A) Less than 20 Hz
  • (B) Between 20 Hz and 2 kHz
  • (C) Between 2 kHz and 20 kHz
  • (D) Greater than 20 kHz
Which of the following statements about visible light, UV light and X-rays is/are correct?
1. The wavelength of visible light is more than that of X-rays.
2. The energy of X-ray photons is higher than that of UV light photons.
3. The energy of UV light photons is less than that of visible light photons.
  • (A) 1, 2 and 3
  • (B) 1 and 2
  • (C) 2 and 3
  • (D) Only 1
The connecting cable of electrical appliances like electric iron, water heater or room heater contains three insulated copper wires of three different colours-red, green and black. Which one of the following is the correct colour code ?
  • (A) Red- live wire, Green-neutral wire, Black- ground wire
  • (B) Red-neutral wire, Green- ground wire, Black- live wire
  • (C) Red-live wire, Green- ground wire, Black- neutral wire
  • (D) Red- ground wire, Green--live wire, Black- neutral wire
Which of the following statements about a microscope and a telescope is/are correct ?
1. Both the eyepiece and the objective of a microscope are convex lenses.
2. The focal length of the objective of a telescope is larger than the focal length of its eyepiece.
3. The magnification of a telescope increases with the increase in focal length of its objective.
4. The magnification of a microscope increases with the increase in focal length of its objective.
  • (A) 1 and 3
  • (B) 1 and 4
  • (C) 2, 3 and 4
  • (D) 1, 2 and 3
Which one of the following statements about the law of conservation of mass is correct ?
  • (A) A given compound always contains exactly same proportion of elements.
  • (B) When gases combine in a reaction, they do so in a simple ratio by volume, provided all gases are at room temperature.
  • (C) Matter can neither be created nor destroyed.
  • (D) Equal volumes of all gases at same temperature and pressure contain equal number of molecules.
Which one of the following statements is correct for a plane mirror?
  • (A) Its focal length is zero.
  • (B) The size of the image of an object placed in front of the mirror is slightly less than that of the object.
  • (C) The image is virtual, erect and laterally inverted.
  • (D) Its focal length is 200

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