Answer: The wire is stretched both from the end so the frequency of stretched wire is as follows: $ v=\frac{n}{2L}\sqrt{\frac{T}{m}} $ As the number of harmonic n, length L, and tension (T) are kept...
c) if all this energy U is in the form of radiation, corresponding momentum is p = U/c. How much momentum per unit time does it impart on unit area at a distance of 1 km? Answer: (c) According to...
a) estimate the power it radiates b) if surrounding has water at 30oC, how much water can 10% of the energy produced evaporate in 1 sec? Answer: a) We know that the expression for the power radiated...
Answer: Consider the following diagram: From the diagram, this much can be said that: $ \theta =\frac{{{\theta }_{1}}+{{\theta }_{2}}}{2} $ The temperature changes in a linear fashion from θ1 to...
Answer: According to the question, we have - αsteel = 1.2 × 10-5/oC and Lo = 10 m ∆T = 20oC Making use of the Pythagoras theorem, we have; $ {{x}^{2}}={{\left[ \frac{1}{2}(L+\Delta L)...
Answer: According to the question, decrease in temperature is as follows: ∆t = 57 – 37 = 20oC The coefficient of linear expansion is as follows: α = 1.7 × 10-5oC And the bulk modulus for copper is:...
Answer: According to the question, the volume of vessel is V = 100 cm3 = 10-4 = constant We also have that the volume of the iron vessel – Volume of brass rod = 10-4 m3 We know that: $ {{\beta...
Answer: Change in length of iron rod is given as follows: $ \Delta L={{\alpha }_{iron}}{{L}_{iron}}\Delta T $ Change in length of brass rod is given as follows: $ \Delta L={{\alpha...
a) fill the remaining bucket completely by cold water and then attend the work b) first attend to the work and fill the remaining bucket just before taking bath. Which option do you think would have...
Answer: According to the question, the mass of water is 100 g At -10 degrees Celsius, the mixture has water and ice The expression for the heat required by the mixture is as follows: ms∆t =...
Answer: The graph above depicts the relationship between water pressure and temperature. When the pressure is increased, the ice becomes liquid, and when the pressure is decreased, it becomes solid....
Answer: The picture above depicts a rod with a uniform mass M and a length l that is bisected perpendicularly. $ I=\frac{1}{12}M{{l}^{2}} $ When the temperature is raised, the rod length increases...
Answer: Copper bottom utensils are utilised because, when compared to steel, copper is a better heat conductor. As a result, copper-bottomed utensils are utilised, and heat is distributed evenly....
Answer: For the construction of the temperature scale, consider two fixed points. The lower fixed point is the initial fixed point, which is for the freezing point. The upper fixed point is the...
Answer: Because the rate of heat transfer through metal is faster than in wood, a metal bar seems to be hotter than a hardwood bar at the same temperature. Similarly, a metal bar appears to be...
Sl.no l (m) ∆T (oC) ∆l (m) 1 2 10 4 × 10-4 2 1 10 4 × 10-4 3 2 20 2 × 10-4 4 3 10 6 × 10-4 If the first observation is correct, what can you say about observations 2, 3, and 4. Answer: Assume that...
Answer: A thermometer's bulb is made of diathermic walls, which allow heat to pass through. The bulb of a thermometer is built of diathermic walls, which enable heat energy to be exchanged between...
a) the rate of cooling is constant till milk attains the temperature of the surrounding b) the temperature of milk falls off exponentially with time c) while cooling, there is a flow of heat from...
a) the region AB represents ice and water in thermal equilibrium b) at B water starts boiling c) at C all the water gets converted into steam d) C to D represents water and steam in equilibrium at...
a) both size gulab jamuns will get heated at the same time b) smaller gulab jamuns are heated before bigger ones c) smaller pizzas are heated before bigger ones d) bigger pizzas are heated before...
a) A system X is in thermal equilibrium with Y but not with Z. System Y and Z may be in thermal equilibrium with each other b) A system X is in thermal equilibrium with Y but not with Z. Systems Y...
a) plate will cool fastest and cube the slowest b) sphere will cool fastest and cube the slowest c) plate will cool fastest and sphere the slowest d) cube will cool fastest and plate the slowest...
Answer: The correct option is d).
a) kinetic energy of random motion of molecules b) kinetic energy of orderly motion of molecules c) total kinetic energy of random and orderly motion of molecules d) kinetic energy of random motion...
a) increases as its effective length increases even though its centre of mass still remains at the centre of the bob b) decreases as its effective length increases even though its centre of mass...
a) buoyancy will be less in water at 0oC than that in water at 4oC b) buoyancy will be more in the water at 0oC than that in water at 4oC c) buoyancy in water at 0oC will be same as that in the...
Answer: The correct answer is b)
a) its speed of rotation increases b) its speed of rotation decreases c) its speed of rotation remains the same d) its speed increases because its moment of inertia increases Answer: The correct...
a) remain straight b) get twisted c) will bend with aluminium on the concave side d) will bend with steel on the concave side Answer: The correct option is d) will bend with steel on the concave...
Solution: Given: Kelvin and Celsius scales are related as: $\mathrm{T}_{\mathrm{C}}=\mathrm{T}_{\mathrm{K}}-273.15 \ldots . \ldots . \ldots . \ldots(1)$ We know that,...