I only
II and IV only
II only
III only
Correct answer is B
In an inelastic collision, linear momentum is conserved and energy is decreased
Momentum and kinetic energy are conserved in elastic collision
Voltmeter
Meter rule
Galvanometer
Potentiometer
Correct answer is D
Voltmeter: an instrument for measuring electric potential in volts
Galvanometer: it is a device used to indicate direction of a small electric current
Potentiometer: is a device for measuring or comparing e.m.fs of cells
Meter rule: measuring a distance at different points
2 m/s
4 m/s
12 m/s
14 m/s
Correct answer is C
d = y, s = 6 m/s (The Man & Plane Mirror)
d – δy, s = (5 &ndash ;6) m/s (The Man and Image)
d2 ÷ s1 = d2 ÷ s2, y ÷ 6 = 2y ÷ s + 6
Y (s + 6) = 2y × 6
s + 6 = 12
So = 12 – 6 = 6
Since S + 6 = 0
Then, S = 6 (substitute the value of S i.e S = 6)
Into S + 6 = 0
∴So = S + 6 = 6 + 6 = 12 m/s
∴ S = 12 m/s
Have high boiling points
have low boiling points
have high densities
have high melting points
Correct answer is B
Volatile liquids (i.e. Ammonia or Freon) are usually have low boiling point
Efficiency of a transformer is equal to
Efficiency of transformer = (secondary coil ÷ primary coil) × 100%
Efficiency of transformer = (mechanical advantage ÷ velocity ratio) × 100%
Efficiency of a transformer = (Number of turns in the secondary coil ÷ Number of turns in the primary coil) × 100%
Efficiency of a transformer = (power developed in the secondary coil ÷ power supplied to the primary coil) × 100%
Correct answer is D
Efficiency of a transformer = (power developed in the secondary coil ÷ power supplied to the primary coil) × 100%