A battery of emf \(10~\text V\) and internal resistance of \(0.5~\Omega\) is connected across a variable resistance \(R.\) The maximum value of \(R\) is given by:
1. \(0.5~\Omega\)
2. \(1.000~\Omega\)
3. \(2.0 ~\Omega\)
4. \(0.25 ~\Omega\)
A battery of emf \(10~\text V\) and internal resistance of \(0.5~\Omega\) is connected across a variable resistance \(R.\) The maximum value of \(R\) is given by:
1. \(0.5~\Omega\)
2. \(1.000~\Omega\)
3. \(2.0 ~\Omega\)
4. \(0.25 ~\Omega\)
2. \(1.000~\Omega\)
3. \(2.0 ~\Omega\)
4. \(0.25 ~\Omega\)
Subtopic: EMF & Terminal Voltage |
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For a gas \(\frac{R}{C_v}=0.67.\) This gas is made up of molecules which are:
| 1. | monoatomic |
| 2. | polyatomic |
| 3. | mixture of diatomic and polyatomic molecules |
| 4. | diatomic |
Subtopic: Specific Heat |
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A point source of light is placed \(4~\mathrm{m}\) below the surface of the water of refractive index \(\frac{5}{3}.\) The minimum diameter of a disc that should be placed over the source on the surface of the water to cut off all light coming out of the water is:
1. \(6~\mathrm{m}\)
2. \(3~\mathrm{m}\)
3. \(4~\mathrm{ m}\)
4. \(2\mathrm{~m}\)
2. \(3~\mathrm{m}\)
3. \(4~\mathrm{ m}\)
4. \(2\mathrm{~m}\)
Subtopic: Total Internal Reflection |
59%
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A moving body of mass \(m\) and velocity \(3\) km/h collides with a rest body of mass \(3\) m and stick to it. Now the combined mass starts to move. What will be the combined velocity?
1. \(4\) km/h
2. \(1\) km/h
3. \(2\) km/h
4. \(3\) km/h
2. \(1\) km/h
3. \(2\) km/h
4. \(3\) km/h
Subtopic: Collisions |
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A transverse wave is represented by the equation; \(y=y_0~\text{sin}\dfrac{2\pi}{\lambda}(vt-x).\)
For what value of the wavelength, \(\lambda,\) does the maximum particle velocity become twice the wave velocity?
For what value of the wavelength, \(\lambda,\) does the maximum particle velocity become twice the wave velocity?
| 1. | \(\lambda=\pi y_0\) | 2. | \(\lambda=\dfrac{\pi y_0}{2}\) |
| 3. | \(\lambda=\dfrac{\pi y_0}{3}\) | 4. | \(\lambda=2\pi y_0\) |
Subtopic: Types of Waves |
73%
From NCERT
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Ionization potential of hydrogen atom is \(13.6\) eV. Hydrogen atoms on the ground state are rarely excited by monochromatic radiation of photon \(12.1\) eV. The special line emitted by a hydrogen atom according to Bohr’s theory will be:
1. one
2. two
3. three
4. four
2. two
3. three
4. four
Subtopic: Bohr's Model of Atom |
57%
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The internal resistance of a primary cell is 4 \(\Omega.\) It generates a current of 0.2 A in an external resistance of 21 \(\Omega.\) The rate at which chemical energy to consumed in providing current is:
1. 1 J/s
2. 5 J/s
3. 0.42 J/s
4. 0.8 J/s
2. 5 J/s
3. 0.42 J/s
4. 0.8 J/s
Subtopic: Heating Effects of Current |
61%
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Two rigid bodies \(A\) and \(B\) rotate with rotational kinetic-energies \(E_A\) and \(E_B\) respectively. The moments of inertia of \(A\) and \(B\) about the axis of rotation are \(I_A\) and \(I_B\) respectively. If \(I_A=\frac{I_B}{4}\) and \(E_A=100=E_0,\) the ratio of angular momentum \((L_A)\) of \(A\) to the angular momentum \((L_B)\) of \(B\) is:
1. \(25\)
2. \(5/4\)
3. \(5\)
4. \(1/4\)
2. \(5/4\)
3. \(5\)
4. \(1/4\)
Subtopic: Angular Momentum |
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The working principle of a ballpoint pen is:
1. Bernoulli's theorem
2. Surface tension
3. Gravity
4. Viscosity
2. Surface tension
3. Gravity
4. Viscosity
Subtopic: Surface Tension |
54%
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