Previous year MCQs

General science UPPSC 2018 GS-I
Question

The sound will have highest velocity in:

Answer & Solution

Answer: (Detailed Solution Below)

Option D: Steel

Detailed Solution:

The correct answer is “Steel”.
Sound waves travel faster through denser materials, and since steel is denser than air or water, it has a higher velocity of sound. In steel, the speed of sound is approximately 5,960 meters per second, while in air it is only about 343 meters per second.

Similar Questions:

If the doors of a refrigerator are left open for a few hours, the room temperature:
  1. A) will decrease
  2. B) will increase
  3. C) will remain the same
  4. D) will decrease only in the area in the vicinity of the refrigerator
Which of the following pars is NOT correctly matched?
  1. A) Oxytocin - Hormone
  2. B) Aspartame - Synthetic sweetener
  3. C) Neoprene - Specialized rubber
  4. D) Rayon - Modified starch
Ripening hormone is:
  1. A) Gibberellin
  2. B) Morphactin
  3. C) Ethylene
  4. D) I.B.A.
Which one of the following is used as the coolant in the "Fast Breeder Test Reactor" at Kalpakkam?
  1. A) Carbon dioxide
  2. B) Heavy water
  3. C) Sea water
  4. D) Molten sodium
The disease caused by swelling of the membrane over spinal cord and brain is:
  1. A) Leukaemia
  2. B) Paralysis
  3. C) Sclerosis
  4. D) Meningitis
What is MRI?
  1. A) Magnetic Record of Intestines
  2. B) Magnetic Recording of Investigations
  3. C) Magnetic Resonance Imaging
  4. D) Magnetic Resonance in Intestines
As compared to boiling water, steam causes more burn to the hand because of
  1. A) Steam has latent heat
  2. B) Steam enters in the body
  3. C) Steam has more orbit
  4. D) Steam is light weight
The mirror used by a dentist to examine the teeth of patients is
  1. A) Concave
  2. B) Convex
  3. C) Plane
  4. D) Cylinderical
Which one of the following is NOT found in space?
  1. A) Pulser
  2. B) Brittle Star
  3. C) Black Hole
  4. D) Quasar
Some marine animals and insects emit light from their body in darkness. This phenomenon is known as.
  1. A) Phosphorescence
  2. B) Bioluminescence
  3. C) Both (a) and (b)
  4. D) None of these
Given below are two statements, one is labelled as Assertion (A) and other as Reason (R) :

Assertion (A): Invert sugar is more sweeter than sucrose.
Reason (R) : Invert sugar is obtained by the hydrolysis of sucrose.

Select the correct answer from the codes given below.
Codes :
  1. A) Both (A) and (R) are true and (R) is the correct explanation of (A)
  2. B) Both (A) and (R) are true but (R) is not the correct explanation of (A)
  3. C) (A) is true but (R) is false
  4. D) (A) is false but (R) is true
A person with vision defect 'Myopia' can see:
  1. A) nearby objects clearly
  2. B) distant objects clearly
  3. C) nearby as well as distant objects clearly
  4. D) neither nearby nor distant objects clearly