Previous year MCQs

General science UPPSC 2017 GS-I
Question

An artificial satellite can be tracked very precisely from the earth by using:

Answer & Solution

Answer: (Detailed Solution Below)

Option A: Doppler effect

Detailed Solution:

The correct answer is “Doppler effect”.
The Doppler effect is used for tracking satellites.

Satellites emit radio signals that are transmitted to Earth. As the satellite moves relative to the Earth, the frequency of the received signal appears to change. This change is known as the Doppler shift.

By measuring the Doppler shift of the satellite's signal, scientists can accurately determine its velocity and position.

Similar Questions:

Where was the International Conference for Peace talks between Israel and Palestine held in 2017?
  1. A) Geneva
  2. B) Washington
  3. C) Paris
  4. D) Berlin
With effect from 1 April, 2017 the minimum wage for unskilled labour in Uttar Pradesh has been fixed at:
  1. A) 7000 per month
  2. B) 7400 per month
  3. C) 7800 per month
  4. D) 8200 per month
Three communicable diseases prevalent in developing countries caused by unsafe drinking water and bad sanitation are:
  1. A) acute diarrhoea, cancer and gout
  2. B) malaria, acute diarrhoea and schistosomiasis
  3. C) onchocerciasis, leukaemia and arthritis
  4. D) rheumatism, malaria and AIDS
A liquid remains hot or cold for a long time in thermos flask because there is no loss or gain of heat by:
  1. A) Conduction
  2. B) Convection and radiation
  3. C) Both (a) and (b)
  4. D) None of the above
Red sea is an example of:
  1. A) Volcanic valley
  2. B) Eroded valley
  3. C) Axial trough
  4. D) U-shaped valley
In which of the following industries is mica used as a raw material?
  1. A) Iron and Steel
  2. B) Toys
  3. C) Glass and Pottery
  4. D) Electrical
Which one of the following gases is used for the purification of drinking water?
  1. A) Sulphur dioxide
  2. B) Chlorine
  3. C) Fluorine
  4. D) Carbon dioxide
According to J.V. Narlikar which of the following has so far NOT been considered as a science?
  1. A) Astrology
  2. B) Astronomy
  3. C) Cosmology
  4. D) Nanotechnology
Assertion (A): Woollen clothes keep us warm.
Reason (R): Wool fibres are made of a particular protein which is a bad conductor of heat.

Select the correct answer using the codes given below:
  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
The velocity of wind is measured by
  1. A) Barometer
  2. B) Anemometer
  3. C) Hydrometer
  4. D) Wind Vane
Photo chemical smog always contains
  1. A) Phosphorus
  2. B) Ozone
  3. C) Methane
  4. D) Aluminium ion
The Tropic of cancer passes through which of the following states? Select the correct answer from the codes given below:

(A) Gujarat
(B) Chattisgarh
(C) Uttar Pradesh
(D) Jharkhand
  1. A) A, B and D
  2. B) A, B, C and D
  3. C) A, C and D
  4. D) B, C and D