u = 15cm only
u = 30cm only
M < 15cm only
u > 30cm only
Correct answer is D
Objects at a distance greater than two times of the focal length produces a real image, inverted and diminished in size.
→ 2 * 15 = 30cm
: At >30cm this is applicable
A freely suspended compass needle on the earth's surface settles in a plane called----------
geographic meridian
magnetic meridian
magnetic declination
isoganals
Correct answer is B
The magnetic meridian is an equivalent imaginary line connecting the magnetic south and north poles and can be taken as the horizontal component of magnetic force lines along the surface of the earth. Therefore, a compass needle will be parallel to the magnetic meridian
20N
25N
40N
100N
Correct answer is C
VR = 5:1 or 5
Load = 20kg or 200N
MA = \(\frac{200}{E}\)
Efficiency% = \(\frac{MA}{VR} * 100\)
100% = \(\frac{200}{5E} * 100\)
5E = 200
E = 40
erect and of the same size as the object
laterally inverted and of the same size as the object
erect and bigger than the object
virtual and if the same size
Correct answer is C
Images formed by plane mirrors are virtual, upright, left-right reversed, the same distance from the mirror as the object's distance, and the same size as the object
An example of a mechanical wave is---------
water waves
radio waves
x-rays
light rays
Correct answer is A
A mechanical wave is a wave that is an oscillation of matter.
A sound wave is a mechanical wave that propagates along or through a medium by particle-to-particle interaction.
Sound waves, water waves and seismic waves are some examples of mechanical waves mechanical wave.