Q91. The information of brilliant colors in a thin soap film is a consequence of the phenomena of
[A] Multiple reflection and interference
[B] Multiple refraction and dispersion
[C] Polarization and interference
[D] Diffraction and dispersion
Q92. Which is the point from where an azimuth originates?
[A] North
[B] West
[C] East
[D] South
Q93. A standing wave occurs when
[A] the speed of the wave is zero or near zero
[B] a wave reflects upon itself
[C] the amplitude of a wave exceeds its wavelength
[D] two waves overlap
Q94. Atmospheric pressure exerted on earth is due to
[A] rotation of earth
[B] gravitational pull
[C] uneven heating of earth
[D] revolution of earth
Q95. Which of the following has the highest frequency?
[A] Radio waves
[B] Cosmic rays
[C] Microwaves
[D] X-rays
Q96. One astronomical unit is the average distance between
[A] Jupiter and the Sun
[B] Pluto and the Sun
[C] Earth and the Sun
[D] Earth and the Moon
Q97. The ___________ is responsible for Earth’s magnetic field.
[A] outer core
[B] crust
[C] inner core
[D] mantle
Q98. A man jumping out of a moving train is thrownÂ
[A] sideways
[B] forward
[C] backward
[D] None of these
Q99. Sound waves cannot travel in
[A] Water
[B] Glass
[C] Hydrogen gas
[D] Vacuum
Q100. Which of the following lies on the reflecting surface of the minor?
[A] Pole
[B] Focal length
[C] Focus
[D] Centre of curvature