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 |
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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; \(y=y_0\sin\frac{2\lambda}{\lambda}(vt-k).\)
For what value of \(\lambda\) is the particle velocity equal to two times the wave velocity?
1. \(\lambda=\pi y_0\)
2. \(\lambda=\frac{\pi y_0}{2}\)
3. \(\lambda=\frac{\pi y_0}{3}\)
4. \(\lambda=2\pi y_0\)
For what value of \(\lambda\) is the particle velocity equal to two times the wave velocity?
1. \(\lambda=\pi y_0\)
2. \(\lambda=\frac{\pi y_0}{2}\)
3. \(\lambda=\frac{\pi y_0}{3}\)
4. \(\lambda=2\pi y_0\)
Subtopic: Types of Waves |
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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 |
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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 |
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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 |
55%
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