Heat and Sources of Heat

What is the meaning of sources of heat?

What are the sources of heat explain and give example?

What are the sources of heat ?

What units are used to measure heat intensity?

How do you calculate heat release rate?

How do you calculate heat and temperature?

An electric fan and a heater are marked as 100 W, 220 V and 1000 W, 220 V respectively. The resistance of heater is

What is thermal energy? Explain with formula to calculate it.

How do you calculate heat calculations?

What is the source of heat?

$m_1 gm$ of ice $0°C; m_2 gm$ of water at $50°C$ and $m_3 gm$ of steam at $100°C$ are mixed together then the correct alternative is-

1. Temperature of mixture is $0°C$ if $m_1\ge \frac{5}{8} m_2+8m_3$

2. Temperature of mixture is $100°C$ if $m_3\ge \frac{5}{54} m_2+\frac{m_1}{3}$

3. Temperature of mixture is $50°C$ if $13m_1=59m_{3.}$

4. Temperature of mixture is $50°C$ if $18m_1=59m_3$

$1kg$of ice $0°C$ is mixed with $1.5kg$ of water at $45°C$ [Latent Heat of fusion$=80 cal/gm$ & specific hat of water $=1 cal/gm°C$] then-

$1.$Temperature of mixture is $0°C$

$2.$ Temperature of mixture is $15°C$

$3.$Mixture contains $156.25gm$of ice

$4.$Mixture contains $843.75$ gm of ice

Column I                                                                     Column II

(I) Final temperature is $2.5°C$                                  (P)$10gm$ water at $30°C$ is mixed with $10gm$of water at $70°C$

(ii) Final mixture contain ice & water                           (Q) $10gm$of ice at $0°C$ is mixed with $10gm$of water at $85°C$

(iii) Final mixture water & steam                                  (R) $10gm$ of ice at $0°C$is mixed with $10gm$of water at $50°C$

(iv) Final temperature is $50°C$                                   (S) $10gm$ of ice at $0°C$ is mixed with $10gm$of steam at $100°C$

Match the column:

Column-I                                                            Column-II

(A) $0°C\le T_{mix}\le 10°C$                          (P) $10gm$ water at $90°C+5gm$ water at $0°C$

(B) $T_{mix}\le 100°C$                                    (Q) $1gm$steam at $100°C+6$ ice at $0°C$

(C) $20°C\le T_{mix}\le 30°C$                        (R) $5gm$ water at $100°C+3$ steam at $100°C$

(D) $30°C\le T_{mix}$                                        (T)$1gm$ water at $0°C+1$ steam at $100°C$

Match the Column:

Column-I                                                                                 Column-II

(A) Final mixture contains only water                                     (P)$1kg$ of ice at $-50°C$ is mixed with $1\times {10}^{-2} kg$ of water at $0°C$

(B) Final mixture contains only ice                                          (Q) $1 kg$ of ice at $0°C$ with the $\frac{1}{3}kg$ of steam at $100°C$

(C) Final mixture contain only steam                                       (R) $\frac{1}{3}kg$ of water at $100°C$ with $1.8kg$of steam of $200°C$

(D) Final temperature is $100°C$                                           (S) $1kg$ of ice at $0°C$ with $1kg$ of water at$100°C$

Match the column:

Column I                                                                    Column-II

(A) Final mixture contains water only                        (P)$5gm$ of ice at $-20°C$ is mixed with $25gm$ of water at $32°C$

(B) Final mixture contains both ice and water           (Q) $5 gm$of ice at $-20°C$ is mixed with $18gm$ of water at $25°C.$

(C) Final mixture's temperature is $0°C$                    (R)$5gm$ of ice at $-20°C$ is mixed with $10gm$ of water at $25°C$

(D) Final temperature of mixture is $10°C$                (S) $50gm$ of ice at $-20°C$ is mixed with $10gm$ of water at $20°C$

                                                                                   (T) $5gm$of water at $0°C$ is mixed with$2.5 gm$ of water at $30°C$

Three liquids A, B and C having same specific heat and mass $m$, $2m$ and $3m$have temperatures 20$°$C, $40°C$and $60°C$ respectively. Temperature of the mixture when :

Column - I                                                                         Column -II

(A) A and B are mixed                                                           (P) $35°C$

(B) A and C are mixed                                                           (Q) $52°C$

(C) B and C are mixed                                                           (R) $50°C$

(D) A, B and C all three are mixed                                         (S) $45°C$

                                                                                               (T) None

Match the column 

Column - 1                                                              Column - 11

(A) Specific heat capacity                                      (P) depends on mass

(B) Latent heat                                                         (Q) Property of substance alone

(C) Heat capacity                                                    (R) Independent of mass

(D) Water equivalent                                              (S) Property of object alone

Three liquids A, B and C are in three separate containers. Temperature of A, B and C are$10°C, 15°C$ and $20°C.$ Mass of each liquid is same. Relation among specific heat capacity of A, B and C are $S_A=2S_B=4S_C$

 Column-I                                                                                Column -II

(A) Thermal energy of A changes                                               (P) When liquid A and B are mixed      

(B)Thermal energy changes of B                                               (Q) When liquid A and C are mixed

(C) Final temperature is$\frac{35}{3}°C$                                                   (R) When liquid B and C are mixed

(D) Final temperature is$\frac{90}{7}°C$                                                   (S) When all three liquids are mixed

The water flowing from the H tap fills the empty container in 3t by itself, the water flowing from the C tap in 2t. Temp of H-tap is 80°C and that of C-tap is 40°. Both taps are opened simultaneously. What is the final temp of water of the filled container?

(Heat exchange is only between waters.)