A photostat machine works on _____________?
A. electromagnetic image making
B. magnetic image making
C. thermal image making
D. electrostatic image making
The owl can see most clearly in total darkness because:
A. it has squint eyes
B. it has light bulbs in its eyes provided by nature
C. it produces infrasonic sounds
D. it has large eyes with orbs directed forward, giving it binocular sight
The audio signals of TV are _____________?
A. Amplitude modulated
B. Frequency modulated
C. fixe modulated
D. Velocity modulated
Which of the following statements is true when we see ‘rainbow’ ?
A. We face sun and raindrops
B. The Sun remains behind us and we face raindrops
C. In light rainfall, we face Sun
D. The sky remains clear and the sun is at lower position in the sky
Rain drops fall from great height Which among the following statements is true regarding it?
A. they fall with that ultimate velocity, which are different for different droplets
B. they fall with same ultimate velocity
C. their velocity increases and they fall with different velocity on the earth
D. their velocity increases and they fall with same velocity on the earth
Why the needle of iron swims on water surface when it is kept gently ?
A. It will remain under the water, when it will displace more water than its weight
B. the density of needle is less than that of water
C. due to surface tension
D. due to its shape
Which of the following are not deflected by electric and magnetic fields ?
A. Alpha rays
B. Beta rays
C. Gamma rays
D. None of these
The value of acceleration due to gravity is minimum on which of these planets?
A. Mars
B. Jupiter
C. Mercury
D. Neptune
The value of R ( Universal Gas Constant ) = ___________?
A. 8.314 J/mole K
B. 6.5 J/mole K
C. 1.314 J/mole K
D. 10.314 J/mole K
Mirage is an example of ___________?
A. reflection of light
B. refraction of light
C. Refraction and total internal reflection of light
D. Scattering of light