MCQOPTIONS
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MCQOPTIONS
This section includes 10 Mcqs, each offering curated multiple-choice questions to sharpen your Physics knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The stress-strain curves for brass, steel and rubber are shown in the figure. The lines A, B and C are for |
| A. | Rubber, brass and steel respectively |
| B. | Brass, steel and rubber respectively |
| C. | live is brown, neutral is blue and earth is black |
| D. | Steel, rubber and brass respectively |
| Answer» D. Steel, rubber and brass respectively | |
| 2. |
The graph shown was obtained from experimental measurements of the period of oscillations T for different masses M placed in the scale pan on the lower end of the spring balance. The most likely reason for the line not passing through the origin is that the [NCERT 1978] |
| A. | Spring did not obey Hooke's Law |
| B. | Amplitude of the oscillations was too large |
| C. | Unchanged |
| D. | Mass of the pan was neglected |
| Answer» E. | |
| 3. |
An elastic material of Young's modulus Y is subjected to a stress S. The elastic energy stored per unit volume of the material is [MP PET 1991; MP PMT 1990, 96; IIT 1992; AIIMS 1997] |
| A. | \[\frac{2Y}{{{S}^{2}}}\] |
| B. | \[\frac{{{S}^{2}}}{2Y}\] |
| C. | charged as well as uncharged particles |
| D. | \[\frac{{{S}^{2}}}{Y}\] |
| Answer» C. charged as well as uncharged particles | |
| 4. |
Two rods of different materials having coefficients of linear expansion \[{{\alpha }_{1}},\,{{\alpha }_{2}}\] and Young's moduli \[{{Y}_{1}}\] and \[{{Y}_{2}}\] respectively are fixed between two rigid massive walls. The rods are heated such that they undergo the same increase in temperature. There is no bending of rods. If \[{{\alpha }_{1}}:{{\alpha }_{2}}=2:3\], the thermal stresses developed in the two rods are equally provided \[{{Y}_{1}}:{{Y}_{2}}\] is equal to [IIT 1989] |
| A. | 0.085416666666667 |
| B. | 0.042361111111111 |
| C. | increase or decrease |
| D. | 0.17291666666667 |
| Answer» D. 0.17291666666667 | |
| 5. |
The compressibility of water is \[4\times {{10}^{-5}}\] per unit atmospheric pressure. The decrease in volume of 100 cubic centimeter of water under a pressure of 100 atmosphere will be [MP PMT 1990] |
| A. | 0.4 cc |
| B. | \[4\times {{10}^{-5}}\,cc\] |
| C. | deficiency of electrons |
| D. | 0.004 cc |
| Answer» B. \[4\times {{10}^{-5}}\,cc\] | |
| 6. |
The pressure of a medium is changed from 1.01 ´ 105 Pa to 1.165 ´ 105 Pa and change in volume is 10% keeping temperature constant. The Bulk modulus of the medium is |
| A. | \[204.8\times {{10}^{5}}Pa\] |
| B. | \[102.4\times {{10}^{5}}Pa\] |
| C. | + 0.04 dioptre |
| D. | 1.55´ 105 Pa |
| Answer» E. | |
| 7. |
The adiabatic elasticity of a gas is equal to\[\] [CPMT 1982] |
| A. | \[\gamma \times \]density |
| B. | \[\gamma \times \]volume |
| C. | A is true but R is false |
| D. | \[\gamma \times \]specific heat |
| Answer» D. \[\gamma \times \]specific heat | |
| 8. |
The bulk modulus of an ideal gas at constant temperature [MP PMT 2004] |
| A. | Is equal to its volume V |
| B. | Is equal to p/2 |
| C. | Only 3 |
| D. | Cannot be determined |
| Answer» D. Cannot be determined | |
| 9. |
Bulk modulus was first defined by [CPMT 1987] |
| A. | Young |
| B. | Bulk |
| C. | Same amount of electric current would pass through both the pieces producing more heat in the thicker one. |
| D. | None of the above |
| Answer» D. None of the above | |
| 10. |
Assertion : Spring balances show correct readings even after they had been used for a long time interval. Reason : On using for long time, spring balances losses its elastic strength. |
| 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. | 110 V leads to lower power loss |
| D. | If the assertion and reason both are false. |
| E. | If assertion is false but reason is true. |
| Answer» F. | |