MCQOPTIONS
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MCQOPTIONS
This section includes 17 Mcqs, each offering curated multiple-choice questions to sharpen your Physics knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
A liquid of mass M and specific heat S is at a temperature 2t. If another liquid of thermal capacity 1.5 times, at a temperature of \[\frac{t}{3}\] is added to it, the resultant temperature will be [EAMCET (Engg.) 1999] |
| A. | \[\frac{4}{3}t\] |
| B. | t |
| C. | \[{{50}^{o}}C\] and \[{{30}^{o}}C\] |
| D. | \[\frac{2}{3}t\] |
| Answer» C. \[{{50}^{o}}C\] and \[{{30}^{o}}C\] | |
| 2. |
A steel scale measures the length of a copper wire as \[80.0\,cm,\] when both are at \[20{}^\circ C\] (the calibration temperature for scale). What would be the scale read for the length of the wire when both are at \[40{}^\circ C\]? (Given asteel \[=11\times {{10}^{-6}}\]per°C and acopper \[=17\times {{10}^{-6}}per\,{}^\circ C\]) [CPMT 2004] |
| A. | \[80.0096\,cm\] |
| B. | \[80.0272\,cm\] |
| C. | \[\frac{1}{\sqrt{2}}\,\,m\text{/}{{s}^{\text{2}}}\] toward north-east |
| D. | \[25.2\,cm\] |
| Answer» B. \[80.0272\,cm\] | |
| 3. |
Three rods of equal length l are joined to form an equilateral triangle PQR. O is the mid point of PQ. Distance OR remains same for small change in temperature. Coefficient of linear expansion for PR and RQ is same i.e. \[{{\alpha }_{2}}\] but that for PQ is \[{{\alpha }_{1}}\]. Then |
| A. | \[{{\alpha }_{2}}=3{{\alpha }_{1}}\] |
| B. | \[{{\alpha }_{2}}=4{{\alpha }_{1}}\] |
| C. | If assertion is true but reason is false. |
| D. | \[{{\alpha }_{1}}=4{{\alpha }_{2}}\] |
| Answer» E. | |
| 4. |
The coefficient of volumetric expansion of mercury is 18 × 10?5/ºC. A thermometer bulb has a volume 10?6 m3 and cross section of stem is 0.004 cm2. Assuming that bulb is filled with mercury at 0ºC then the length of the mercury column at 100ºC is [Pb. PMT 1998, DPMT 1997, 2001] |
| A. | 18.8 mm |
| B. | 9.2 mm |
| C. | If assertion is true but reason is false. |
| D. | 4.5 cm |
| Answer» E. | |
| 5. |
A glass flask is filled up to a mark with 50 cc of mercury at 18ºC. If the flask and contents are heated to 38ºC, how much mercury will be above the mark? (a for glass is 9 × 10?6/ºC and coefficient of real expansion of mercury is 180 × 10?6/ºC) [EAMCET 1997] |
| A. | 0.85 cc |
| B. | 0.46 cc |
| C. | If assertion is true but reason is false. |
| D. | 0.05 cc |
| Answer» D. 0.05 cc | |
| 6. |
The point on the pressure temperature phase diagram where all the phases co-exist is called [MH CET 2005] |
| A. | Sublimation |
| B. | Fusion point |
| C. | If assertion is true but reason is false. |
| D. | Vaporisation point |
| Answer» D. Vaporisation point | |
| 7. |
The thermal capacity of a body is 80 cal, then its water equivalent is [UPSEAT 2001] |
| A. | 80 cal / gm |
| B. | 8 gm |
| C. | \[\frac{\tan \,{{\varphi }_{1}}}{\tan \,{{\varphi }_{2}}}=\frac{{{\theta }_{1}}}{{{\theta }_{2}}}\] |
| D. | 80 kg |
| Answer» D. 80 kg | |
| 8. |
300 gm of water at 25°C is added to 100 gm of ice at 0°C. The final temperature of the mixture is [MP PET 2004] |
| A. | \[-\frac{5}{3}{}^\circ C\] |
| B. | \[-\frac{5}{2}{}^\circ C\] |
| C. | 125 cm from 100°C end |
| D. | 0°C |
| Answer» E. | |
| 9. |
50 gm of ice at 0°C is mixed with 50 gm of water at 80°C, final temperature of mixture will be [DCE 2002] |
| A. | 0°C |
| B. | 40°C |
| C. | Less than 7 hours |
| D. | 4°C |
| Answer» B. 40°C | |
| 10. |
A lead bullet of 10 g travelling at 300 m/s strikes against a block of wood and comes to rest. Assuming 50% of heat is absorbed by the bullet, the increase in its temperature is (Specific heat of lead = 150J/kg, K) [EAMCET 2001] |
| A. | 100°C |
| B. | 125°C |
| C. | Radiation |
| D. | 200°C |
| Answer» D. 200°C | |
| 11. |
The temperature of Bhakhra dam water at the ground level with respect to the temperature at high level should be |
| A. | Greater |
| B. | Less |
| C. | In hot air near the roof and cool air out near the bottom |
| D. | 0°C |
| Answer» B. Less | |
| 12. |
A body of mass 5 kg falls from a height of 30 metre. If its all mechanical energy is changed into heat, then heat produced will be [CPMT 1975] |
| A. | 350 cal |
| B. | 150 cal |
| C. | Radiation |
| D. | 6 cal |
| Answer» B. 150 cal | |
| 13. |
100 gm of ice at 0°C is mixed with 100 g of water at 100°C. What will be the final temperature of the mixture [SCRA 1996; AMU 1999] |
| A. | 10°C |
| B. | 20°C |
| C. | Thickness of the plate |
| D. | 40°C |
| Answer» B. 20°C | |
| 14. |
Amount of heat required to raise the temperature of a body through 1K is called its [KCET 1996; MH CET 2001; AIEEE 2002] |
| A. | Water equivalent |
| B. | Thermal capacity |
| C. | |
| D. | Specific heat |
| Answer» C. | |
| 15. |
Compared to a burn due to water at 100°C, a burn due to steam at 100°C is [KCET 1999; UPSEAT 1999] |
| A. | More dangerous |
| B. | Less dangerous |
| C. | \[9\times {{10}^{3}}J\] |
| D. | None of these |
| Answer» B. Less dangerous | |
| 16. |
80 gm of water at 30°C are poured on a large block of ice at 0°C. The mass of ice that melts is [CBSE PMT 1989] |
| A. | 30 gm |
| B. | 80 gm |
| C. | Metal has low specific heat |
| D. | 150 gm |
| Answer» B. 80 gm | |
| 17. |
Assertion : A brass disc is just fitted in a hole in a steel plate. The system must be cooled to loosen the disc from the hole. Reason : The coefficient of linear expansion for brass is greater than the coefficient of linear expansion for steel. |
| A. | If both assertion and reason are true and the reason is the correct explanation of the assertion. |
| B. | If both assertion and reason are true but reason is not the correct explanation of the assertion. |
| C. | 25 : 1 |
| D. | If the assertion and reason both are false. |
| E. | If assertion is false but reason is true. |
| Answer» B. If both assertion and reason are true but reason is not the correct explanation of the assertion. | |