Assertion (A): A standing bus suddenly accelerates. If there was no friction between the feet of a passenger and the floor of the bus, the passenger would move back.
Reason (R): In the absence of friction, the floor of the bus would slip forward under the feet of the passenger.
 
1. (A) is true but (R) is false.
2. (A) is false but (R) is true.
3. Both (A) and (R) are true and (R) is the correct explanation of (A).
4. Both (A) and (R) are true but (R) is not the correct explanation of (A).

Subtopic:  Newton's Laws |
 61%
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A linearly polarized monochromatic light of intensity \(10\) lumen is incident on a polarizer. The angle between the direction of polarization of the light and that of the polarizer such that the intensity of output light is \(2.5\) lumen is:

1. \(60^\circ\) 2. \(75^\circ\)
3. \(30^\circ\) 4. \(45^\circ\)
Subtopic:  Polarization of Light |
 65%
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The ratio of the radii of two circular coils is \(1:2\). The ratio of currents in the respective coils such that the same magnetic moment is produced at the centre of each coil is:
1. \(4:1\)
2. \(2:1\)
3. \(1:2\)
4. \(1:4\)

Subtopic:  Magnetic Moment |
 61%
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A gas undergoes an isothermal process. The specific heat capacity of the gas in the process is:
1. infinity
2. \(0.5\)
3. zero
4. \(1\)

Subtopic:  Molar Specific Heat |
 67%
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Two amplifiers of voltage gain 20 each, are cascaded in series. If 0.01 volt a.c. input signal is applied across the first amplifier, the output a.c. signal of the second amplifier in volts is:
1. 2.0
2. 4.0
3. 0.01
4. 0.20

Subtopic:  Applications of Transistor (OLD NCERT) |
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A hollow metal sphere of radius \(R\) is given \(+Q\) charges to its outer surface. The electric potential at a distance \(\frac{R}{3}\) from the centre of the sphere will be:

1. \(\frac{1}{4\pi \varepsilon_0}\frac{Q}{9R}\) 2. \(\frac{3}{4\pi \varepsilon_0}\frac{Q}{R}\)
3. \(\frac{1}{4\pi \varepsilon_0}\frac{Q}{3R}\) 4. \(\frac{1}{4\pi \varepsilon_0}\frac{Q}{R}\)
Subtopic:  Electric Potential |
 62%
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The dimensions of mutual inductance \((M)\) are:
1. \([M^2LT^{-2}A^{-2}]\)
2. \([MLT^{-2}A^{2}]\)
3. \([M^{2}L^{2}T^{-2}A^{2}]\)
4. \([ML^{2}T^{-2}A^{-2}]\)

Subtopic:  Mutual Inductance |
 71%
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The plot of current \(I~\text{(A)}\) flowing through a metallic conductor versus the applied voltage \(V~\text{(volt)}\) across the ends of a conductor is:

1.   2.
3. 4.
Subtopic:  Derivation of Ohm's Law |
 78%
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A network of resistors is connected across a \(10~\text{V}\) battery with an internal resistance of \(1~\Omega\) as shown in the circuit diagram. The equivalent resistance of the circuit is:
         
1.  \(\frac{17}{3}~\Omega\)
2.  \(\frac{14}{3}~\Omega\)
3.  \(\frac{12}{7}~\Omega\)
4.  \(\frac{14}{7}~\Omega\)

Subtopic:  Combination of Resistors |
 72%
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 When a body of mass \(m\) just begins to slide as shown, match list-I with list-II:

List-I List-II
(a) Normal reaction (i) \(P\)
(b) Frictional force (fs) (ii) \(Q\)
(c) Weight (mg) (iii) \(R\)
(d) mgsin\(\theta ~\) (iv) \(S\)
  
Choose the correct answer from the options given below:
(a) (b) (c) (d)
1. (ii) (i) (iii) (iv)
2. (iv) (ii) (iii) (i)
3. (iv) (iii) (ii) (i)
4. (ii) (iii) (iv) (i)
Subtopic:  Application of Laws |
 83%
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