Science Quiz: Day: 100

September 5, 2022

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

Show Answer

ANSWER- C

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

Show Answer

ANSWER- D

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

Show Answer

ANSWER- C

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

Show Answer

ANSWER- C

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

Show Answer

ANSWER- D

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

Show Answer

ANSWER- B

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

Show Answer

ANSWER- C

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

Show Answer

ANSWER- D

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.

Show Answer

ANSWER- C

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

Show Answer

ANSWER- C