NEET 2022 | Biotechnology and its Uses | Jaiv Praudyogiki Evan Uske Upayog | L - 5 | Maha Quiz

To determine the sound propagation velocity in air by acoustic resonance technical one can use a pipe with a piston and a sonic membrane closing one of its ends. Find the velocity of sound if the distance between the adjacent positions of the piston at which resonance is observed at a frequency v=2000Hz is equal to l=8.5 cm.

A 0.0500 kg lead bullet of volume 5.00 xx 10^(-6) m ^(3) at 20.0^(@)C hits a block that is made of an ideal thermal insulator and comes to rest at its center. At that time, the temperature of the bullet is 327^(@)C . Use the following information for lead : Coefficient of linear expansion : alpha = 2.0 xx 10^(-5)// ""^(@)C Specific heat capacity : c = 128 J // ( kg . ""^(@)C ) Latent heat of fusion : L_(1) = 23 300 J // kg Melting point : T_("melt") = 327^(@)C How much heat was needed to raise the bullet to its final temperature ?

A 0.0500 kg lead bullet of volume 5.00 xx 10^(-6) m ^(3) at 20.0^(@)C hits a block that is made of an ideal thermal insulator and comes to rest at its center. At that time, the temperature of the bullet is 327^(@)C . Use the following information for lead : Coefficient of linear expansion : alpha = 2.0 xx 10^(-5)// ""^(@)C Specific heat capacity : c = 128 J // ( kg . ""^(@)C ) Latent heat of fusion : L_(1) = 23 300 J // kg Melting point : T_("melt") = 327^(@)C What is the volume of the bullet when it comes to rest ?

A typical light dimmer used to dim the stage lights in a theater consists of a variable induction for L (where inductance is adjustable between zero and L_(max) ) conneced in series with a light bulb B as shown in fig. the mains electrical supply is 220 V at 50 Hz, the light bulb is rated at 220 V, 1100 W. What (L_(max)) is required if the rate of energy dissipated in the light blub is to be varied by a factor of 5 from its upper limits of 1100 W?

The Young's modulus Y is determined by stretching a wire by using the formula , Y = (4FL)/(pi d^(2)l) where F is the streching force , L is length of wire , l is extension in length and d is its diameter . If F is of the order of 500 N and known to 1 part in 1000 L , is of the order of 3 m and measured with an accuracy of 1 mm , l is of the order of 5 mm measured to 0.1 mm and d is of the order of 1 mm measured correct upto 0.01 mm , estimate the percentage error in the measurement of Y .

Entropy is a state function and its value depends on two or three variable temperature (T), Pressure(P) and volume (V). Entropy change for an ideal gas having number of moles(n) can be determined by the following equation. DeltaS=2.303 "nC"_(v)"log"((T_(2))/(T_(1))) + 2.303 "nR log" ((V_(2))/(V_(1))) DeltaS=2.303 "nC"_(P) "log"((T_(2))/(T_(1))) + 2.303 "nR log" ((P_(1))/(P_(2))) Since free energy change for a process or a chemical equation is a deciding factor of spontaneity , which can be obtained by using entropy change (DeltaS) according to the expression, DeltaG = DeltaH -TDeltaS at a temperature T What would be the entropy change involved in thermodynamic expansion of 2 moles of a gas from a volume of 5 L to a volume of 50 L at 25^(@) C [Given R=8.3 J//"mole"-K]

A sample of oxygen gas expands its volume from 3L to 5L against a constant pressure of 3 atm. If work done during expansion be used to heat 10 mole of water initially present at 290K , its finally temperature will be ( specific heat capacity of water =4.18 J//k-g) :