6.67N
6.56N
7.5N
8.6N
Correct answer is A
F = (Gm1m2) ÷ r2
M1 = 1024Kg, M2 = 1027Kg , r = 102
(Note: the gravitational constant of G = \(6.67 × 10^{ 7ndash; 11}\) \( Nm^2/Kg^2 \)
F = \( (6.67 × 10^{– 11 + 24 + 27)} 10^40 = 6.67 × (10^40 ÷ 10^40)
= 6.67N
f = 6.67N
Mechanical energy
Stationary energy
Potential energy
Vibrational energy
Correct answer is C
Energy due to position T is potential energy (P.E)
Energy due to motion is kinetic energy (K.E)
III only
II & III only
I only
II, III & IV only
Correct answer is C
Simple pendulum does not depend on thermal expansion
Five alarms, Thermostat and Bimetallic thermometer are application of thermal expansion of solid
There is an explanation video available below.
Which of the following is not luminous object?
The sun
The moon
light candle
Star
Correct answer is B
Sun are self luminous source
Moon is a non – luminous
There is an explanation video available below.
He saw a flying objects
He must be thinking of water and food
He was seeing the shadow of the car
The sun ray from the sky were passing from a hot air (layer) to cold layer
Correct answer is D
The appearance of pool of water on road surfaces is called MIRAGE
His observation show that light from the sun ray refracted through a layer of hot air(layer) which is closed to the ground, passes from a hot air layer to the cold layer