Question 1. Which of the following atmospheric layers is responsible for the deflection of radio waves?
(A) Ionosphere
(B) Mesosphere
(C) Stratosphere
(D) Troposphere
Question 2. Which waves cannot be transmitted through vacuum?
(A) Electromagnetic
(B) Sound
(C) Heat
(D) Light
Question 3. Long radio waves are reflected by which of the following layer of Earth’s surface?
(A) Stratosphere
(B) Tropopause
(C) Ionosphere
(D) Troposphere
Question 4. Wireless communication is reflected back to the Earth’s surface by the_____.
(A) Exosphere
(B) Ionosphere
(C) Stratosphere
(D) Troposphere
Question 5. Cosmic rays________.
(A) are charged particles
(B) can be charged as well as uncharged
(C) are uncharged particles
(D) None of the above
Question 6. Which one of the following statements is not true about cosmic rays?
(A) They originate from the Sun
(B) They are made of highly energetic charged particles
(C) They have very short wavelength
(D) They are electromagnetic waves
Question 7. What is the distance between two successive crests or successive troughs called?
(A)Amplitude
(B) Frequency
(C) Wavelength
(D) None of these
Question 8. Which one of the following is used for determining the structure of crystal?
(A) Visible lights
(B) UV rays
(C) X-rays
(D) Gamma rays
Question 9. Which of the following is a mechanical wave?
(A) Sound waves
(B) Light waves
(C) X-rays
(D) Radio waves
Question 10. A radar which detects the presence of an enemy aircraft uses_______.
(A) Ultrasound waves
(B) Sound waves
(C) Radio waves
(D) Light waves
Question 11. When there is depletion of ozone in the stratosphere, the wavelength of radiation striking the Earth’s surface will be______.
(A) 100 m
(B) 10–2 m
(C) 10–7 m
(D) 10–10 m
Question 12. Which one of the following types of waves are used in a Night Vision apparatus?
(A) Radio waves
(B) Infra-red waves
(C) Micro waves
(D) None of the above
Question 13. Waves used for telecommunication are_______.
(A) Microwave
(B) Ultraviolet
(C) Infrared
(D) Visible light
Question 14. FM broadcasting service uses the range of frequency bands between_______.
(A) 88-108 MHz
(B) 76-87 MHz
(C) 54-75 MHz
(D) 109-139 MHz
Question 15. Following rays are used in the diagnosis of intestinal diseases________.
(A) g-rays
(B) b-rays
(C) a-rays
(D) X-rays
Question 16. CT scan is done by using_______.
(A) X-Rays
(B) Visible Light
(C) Ultrasonic Waves
(D) Infra-red Rays