Previous year MCQs

General science UPPSC 2015 GS-I
Question

The mirror used by the dentists to see the teeth of the patients is:

Answer & Solution

Answer: (Detailed Solution Below)

Option A: concave

Detailed Solution:

The correct answer is “concave”.
Dentists use concave mirrors to see teeth and other areas in the mouth. This is because a concave mirror forms a virtual, erect and enlarged image when the object is placed within focus.

Similar Questions:

The drug obtained from the bark of cinchona, was used for treating malaria. The synthetic drug which replaced the natural product is:
  1. A) Chloromycetin
  2. B) Chloroquine
  3. C) Tetracycline
  4. D) Ampiciline
The colour of light is determined by its
  1. A) Amplitude
  2. B) Wavelength
  3. C) Intensity
  4. D) Velocity
Given below are two statements, one labelled as Assertion (A) and the other as Reason (R).

Assertion (A): Most of the vitamins are not synthesised in human body.
Reason (R): Human organ synthesise only essential micronutrients.

Select the correct answer form the code given below.
  1. A) Both (A) & (R) are true & (R) is correct explanation of (A)
  2. B) Both (A) & (R) are true, but (R) is not correct explanation of (A)
  3. C) (A) is true, but (R) is false.
  4. D) A) is false, but (R) is true.
The most important part of a computer is
  1. A) CPU
  2. B) Key Board
  3. C) Disc
  4. D) Printer
Laser beam is used for:
  1. A) treatment of cancer
  2. B) treatment of heart
  3. C) treatment of eye
  4. D) treatment of kidney
With which of the following is the tape of the tape recorder coated?
  1. A) Copper sulphate
  2. B) Ferromagnetic powder
  3. C) Zinc oxide
  4. D) Mercury
Nitrogen is NOT an essential constituent of:
  1. A) Chlorophyll
  2. B) RNA
  3. C) DNA
  4. D) Carbohydrate
Average blood pressure of human being is:
  1. A) 60/100
  2. B) 20/80
  3. C) 60/140
  4. D) 120/80
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
Match List-I and List-II and select the correct answer from the code given below the lists:
List-I (Plant) - List-II (Use)

A. Brahmi - 1. Anti-diabetic
B. Sadabahar - 2. Carminative
C. Pudina - 3. Expectorant
D. Tulsi - 4. Brain Tonic

Code:
A B C D
  1. A) 1 2 3 4
  2. B) 4 1 2 3
  3. C) 3 2 1 4
  4. D) 2 4 3 1
The Black Hole Theory was propounded by:
  1. A) CV Raman
  2. B) H.J Bhabha
  3. C) S. Chandrashekhar
  4. D) Hargovind Khurana
The movement of nutrient elements through the various components of an ecosystem is called.
  1. A) Bio-geo-chemical cycle
  2. B) Bio-geological cycle
  3. C) Ecological succession
  4. D) Biological cycle