A/L 2001 Physics MCQ - Questions 41 - 50

41. The frequency of a tuning fork is 256 Hz. When it sounded with a sonometer wire, 3 beats per second were heard. When the tension of the wire is reduced, again 3 beats per second were heard. The frequency of the sonometer wire after reducing the tension is
1. (1) 250 Hz
2. (2) 253 Hz
3. (3) 256 Hz
4. (4) 259 Hz
5. (5) 262 Hz
6. Answer with explanation
42. The
    
    rod AB is made by connecting two identical metal rode with a thin piece of a poorly conducting material C as shown in the figure. The rod is well lagged except at the two ends. If a steady heat flow in maintained from A to B, the variations of the temperature (θ) along the rod is best represented by
1. (1) 
2. (2) 
3. (3)
4. (4)
5. (5)
6. Answer with explanation
43. Heat
    
    supplied at a constant rate to a certain amount of ice. The variation of temperature θ with time t is shown in the figure. If the specific heat capacity of ice is C and specific latent heat of fusion of ice is L,  ratio is
1. (1)
2. (2)
3. (3)
4. (4)
5. (5)
6. Answer with explanation
44. An ideal gas is kept inside a rigid container. The variations of pressure (P) inside the container with the absolute temperature (T) before adding the second gas (a) and after adding a second gas (b) are best represented by
1. (1)
2. (2)
3. (3)
4. (4)
5. (5)
6. Answer with explanation
45. Consider the following two circuit diagrams. V₁ and V₂ are voltmeter readings and I₁ and I₂ are ammeter readings. If the voltmeters and ammeters are ideal and the internal resistance of the cells are negligible, which of the following is true
    
1. (1) V₂ = V₁ and I₂ > I₁
2. (2) V₂ = V₁ and I₂ < I₁
3. (3) V₂ > V₁ and I₂ > I₁
4. (4) V₂ > V₁ and I₂ > I₁
5. (5) V₂ = V₁ and I₂ = I₁
6. Answer with explanation
46. A circuit contains 75 Ω resistor and an unknown resistor / resistors in a box (B) as shown in the diagram. The internal resistance of the battery is negligible.
    
    
    If the voltage across 75 Ω is 9 V. Which of the following represents the unknown resistor / resistors?
1. (1)
2. (2)
3. (3)
4. (4)
5. (5)
6. Answer with explanation
47. The
    
    diagram shows a resistance (AB), an ideal voltmeter and an ideal ammeter connected to a voltage source. The voltmeter reading (V) and the ammeter reading (I) were taken while the contact P is sliding along the resistance AB from A to B. Which pair of graphs would correctly represents the variation of I and V with x?
1. (1)
2. (2)
3. (3)
4. (4)
5. (5)
6. Answer with explanation
48. The two cells of e.m.f.'s E₁ and E₂ (E₁ > E₂) shown in the circuit have negligible internal resistance. For what value of R will the ammeter A reads zero current?
    
1. (1)
2. (2)
3. (3)
4. (4)
5. (5)
6. Answer with explanation
49. A 741 operational amplifier is powered with supply voltages of ± 15 V. If V₁ and V₂ represent the input voltages and V_o represents the output voltage, the variation of V_o with (V₁ - V₂) is best represented by
1. (1)
2. (2)
3. (3)
4. (4)
5. (5)
6. Answer with explanation
50. Which one of the following circuits draws the largest current from the 6 V cell?
1. (1)
2. (2)
3. (3)
4. (4)
5. (5)
6. Answer with explanation

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A/L 2001 Physics MCQs: 1 - 10 | 11 - 20 | 21 - 30 | 31 - 40 | 41 - 50 | 51 - 60