UPPSC 2021 GS-I General science
Question

Which of the following types of glass can cut off ultraviolet rays?

Answer & Solution

Answer: (Detailed Solution Below)

Option D: Crookes glass

Detailed Solution:

The correct answer is “Crookes glass”.

Crookes glass is specifically designed to block ultraviolet (UV) rays. It has been used in laboratory equipment, especially in UV-sensitive applications.

Similar Questions:

Insulin is a type of:
  1. Hormone
  2. Enzyme
  3. Vitamin
  4. Salt
Electric motors operating at low voltages tend to burn out because
  1. they draw more current which is inversely proportional to the voltage
  2. they draw more current which is inversely proportional to the square root of the voltage
  3. they draw heat proportional to v2
  4. low voltage sets in electrical discharge
The thermometer suitable to measure 2000 °C is
  1. gas thermometer
  2. mercury thermometer
  3. total radiation pyrometer
  4. vapour pressure thermometer
Assertion (A): Some bacteria can synthesise their own food.
Reason (R): These bacteria have green matter called chloroplasts.

Codes:
  1. Both A and R are true and R is the correct explanation of A
  2. Both A and R are true but R is not the correct explanation of A
  3. A is true but R is false
  4. A is false but R is true
Under the Constitution of India which of the following is NOT Fundamental Duty?
  1. To vote in General Election
  2. To develop the scientific temper
  3. To safeguard public property
  4. To abide by the Constitution and respect its ideas
Biological Oxygen Demand(BOD) is a standard criteria for -
  1. Pollution assay in aquatic ecosystems
  2. Assaying 02 level in high altitude regions
  3. Measuring 02 level in blood
  4. Computing 02 level in forest ecosystems
Photosynthesis using the invisible part of the sunlight is done by some
  1. Trees
  2. Algae
  3. Bacteria
  4. Fungi
Which of the following is NOT correctly matched ?
  1. Hundru Waterfall - Subarnarekha River
  2. Chachai Waterfall - Bihad River
  3. Dhuadhar Waterfall - Narmada River
  4. Budha Ghagh Waterfall - Kanchi River
Which one of the following is NOT common between Malaria and Dengue?
  1. Fever
  2. Mosquito bite
  3. Human species
  4. Mosquito species
Which one of the following rivers is NOT the part of Indian Ganga river basin?
  1. Punpun river
  2. Ajoy river
  3. Jalangi river
  4. Jonk river
Match List-I with List-II and select the correct answer using the codes given below:
List I - List II

A) Kevlar - 1) Explosive
B) Taxol - 2) Synthetic fibre
C) Zink Phosphide - 3) Anticancer drug
D) Nitrocellulose - 4) Rodenticide
  1. A-2, B-4, C-3, D-1
  2. A-2, B-3, C-4, D-1
  3. A-4, B-3, C-1, D-2
  4. A-3, B-1, C-2, D-4
Which one of the following is a natural polymer?
  1. Bakelite
  2. Silk
  3. Kevlar
  4. Lexan