dimagi paheli - 100 Which is the real shadow? | Paheiyan | Riddle in hindi #shorts

(a). What is gypsum? What happens when gypsum is heated to 100^(@)C (373K)? (b) Name a sodium compound which is used for making borax and glass. (c) Name the compound which is used in hospitals for setting fractured bones. (d) Which is the real bleaching agent present in bleaching powder?

A point source of light is hung 30 feet directly above a straight horizontal path on which a man of 6 feet in height is walking.How fast is the man's shadow lengthening and how fast the tip of shadow is moving when he is walking away from the light at the rate of 100 ft/min.

A girl walks 100 m straight from her home, to go to the market during her morning walk. Then she turns left for 60 m, then 85 mtuming her right and then again turns right for 60 m, she can see 'her shadow now. Therefore, in which direction is the entry gate of her house facing and what is the shortest distance from her current location to ther home?

Electric fuse is a protective device used in series with an electric circuit or an electric appliance to save it from damage due to overheating porduced by strong current in the circuit or application. Fuse wire is generally made from an alloy of lead and tin, which has hifh resistance and low melting point. It is connected in series in an electric installation. If a circuit gets accidentally short-circuited, a large current flows, then fuse wire melts away, which causes a break in the circuit. The power through fuse (F') is equal to heat energy lost per unit area per unit time (h) (neglecting heat loses from ends of the wire). P = I^2R = h xx 2pirl [R = (rhol)/(pir^2)] where r and l are the length and radius of fuse wire, respectively. A Battery is described by its emf (E) and internal resistance (r). Efficiency of battery (eta) is defined as the ratio of the output to the input power. eta = (Output power)/(Input power) xx 100% But I= E//(R+r), input power = EI. Output power = EI - I^2r , then. eta = ((EI - I^2r)/(EI)) xx 10 (1-(Ir)/E) xx 100 =1 - (E/(R+r)) (r/E) xx 100 = (R/(R+r)) xx 100 We know that output power of a source is maximum when the external resistance is equal to internal resistance, i.e., R = r . Efficiency of a battery (nonideal) when delivering the maximum power is

On morning at 8 A. M. Navneet and Ravneet were standing on a lawn with their back towards each other at the distance of 100m . Navneet's shadow fell exactly towards his left hand side. After 15 minutes, Ravneet turns 135^(@) anti - clockwise . Which direction Ravneet is facing now ?