In Young's-double slit experiment, the distance between the slits and the screen is doubled. The separation between the slits is reduced to half. As a result the fringe width:
| 1. | is halved |
| 2. | become four times |
| 3. | remains unchanged |
| 4. | is doubled |
Subtopic: Young's Double Slit Experiment |
80%
From NCERT
NEET - 2013
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Two rods are joined end to end, as shown. Both have a cross-sectional area of \(0.01~\text{cm}^2.\) Each is \(1~\text{m}\) long. One rod is of copper with a resistivity of \(1.7\times10^{-6}~\Omega\text{-cm},\) the other is of iron with a resistivity of \(10^{-5}~\Omega\text-\text{cm}.\) How much voltage is required to produce a current of \(1~\text A\) in the rods?
1. \(0.00145~\text V\)
2. \(0.0145~\text V\)
3. \(1.7\times10^{-6}~\text V\)
4. \(0.117~\text V\)
1. \(0.00145~\text V\)
2. \(0.0145~\text V\)
3. \(1.7\times10^{-6}~\text V\)
4. \(0.117~\text V\)
Subtopic: Derivation of Ohm's Law |
64%
From NCERT
NEET - 2013
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A long straight wire carries a certain current and produces a magnetic field \(2 \times 10^{-4} ~\text{Wb/m}^2\) at a perpendicular distance of \(5~\text{cm}\) from the wire. An electron situated at \(5~\text{cm}\) from the wire moves with a velocity \(10^7 ~\text{m/s}\) towards the wire along perpendicular to it. The force experienced by the electron will be:
(The charge on electron = \(1.6 \times 10^{-19} ~\text C\) )
1. \(3.2~\text N\)
2. \(3.2 \times 10^{-16} ~\text N\)
3. \(1.6 \times 10^{-16} ~\text N\)
4. zero
(The charge on electron = \(1.6 \times 10^{-19} ~\text C\) )
1. \(3.2~\text N\)
2. \(3.2 \times 10^{-16} ~\text N\)
3. \(1.6 \times 10^{-16} ~\text N\)
4. zero
Subtopic: Lorentz Force |
75%
From NCERT
NEET - 2013
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The output from a \(\mathrm{NAND}\) gate is divided into two in parallel and fed to another \(\mathrm{NAND}\) gate. The resulting gate is a:
1. \(\mathrm{AND}\) gate
2. \(\mathrm{NOR}\) gate
3. \(\mathrm{OR}\) gate
4. \(\mathrm{NOT}\) gate
1. \(\mathrm{AND}\) gate
2. \(\mathrm{NOR}\) gate
3. \(\mathrm{OR}\) gate
4. \(\mathrm{NOT}\) gate
Subtopic: Logic gates |
78%
From NCERT
NEET - 2013
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The ratio of radii of gyration of a circular ring and a circular disc, of the same mass and radius, about an axis passing through their centres and perpendicular to their planes are:
| 1. | \(1 : \sqrt 2\) | 2. | \(3:2\) |
| 3. | \(2:1\) | 4. | \( \sqrt 2 : 1 \) |
Subtopic: Moment of Inertia |
77%
From NCERT
NEET - 2013
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The pair of quantities having the same dimensions are:
| 1. | impulse and surface tension |
| 2. | angular momentum and work |
| 3. | work and torque |
| 4. | Young's modulus and energy |
Subtopic: Dimensions |
83%
From NCERT
NEET - 2013
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A system is taken from state \(a\) to state \(c\) by two paths \(adc\) and \(abc\) as shown in the figure. The internal energy at \(a\) is \({U}_{a}=10~\text{J}.\) Along the path \(adc\) the amount of heat absorbed \(\delta Q_1=50~\text{J}\) and the work obtained \(\delta W_1=20~\text{J}\) whereas along the path \(abc\) the heat absorbed \(\delta Q_2 = 36~\text{J}.\) The amount of work along the path \(abc\) is:
| 1. | \(10~\text{J}\) | 2. | \(12~\text{J}\) |
| 3. | \(36~\text{J}\) | 4. | \(6~\text{J}\) |
Subtopic: First Law of Thermodynamics |
81%
From NCERT
NEET - 2013
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The primary coil of a transformer, when connected to a \(10~\text{V}\text-\)DC battery, draws a current of \(1~\text{mA}.\) The number of turns in the primary and secondary coils are \(50\) and \(100,\) respectively. The voltage across the secondary coil and the current drawn by the circuit in the secondary are respectively:
| 1. | \(20~\text{V}\) and \(2.0~\text{mA}\) |
| 2. | \(10~\text{V}\) and \(0.5~\text{mA}\) |
| 3. | zero and therefore no current |
| 4. | \(20~\text{V}\) and \(0.5~\text{mA}\) |
Subtopic: Transformer |
From NCERT
NEET - 2013
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How does the binding energy per nucleon vary with the increase in the number of nucleons?
| 1. | decrease continuously with mass number. |
| 2. | first decreases and then increases with an increase in mass number. |
| 3. | first increases and then decreases with an increase in mass number. |
| 4. | increases continuously with mass number. |
Subtopic: Nuclear Binding Energy |
81%
From NCERT
NEET - 2013
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The length of a wire between the two ends of a sonometer is \(100~\text{cm}.\) What should be the positions of two bridges below the wire so that the three segments of the wire have their fundamental frequencies in the ratio \(1:3:5\)?
| 1. | \(\dfrac{1500}{23} \mathrm{~cm}, \dfrac{500}{23} \mathrm{~cm} \) |
| 2. | \(\dfrac{1500}{23} \mathrm{~cm}, \dfrac{300}{23} \mathrm{~cm} \) |
| 3. | \(\dfrac{300}{23} \mathrm{~cm}, \dfrac{1500}{23} \mathrm{~cm} \) |
| 4. | \(\dfrac{1500}{23} \mathrm{~cm}, \dfrac{2000}{23} \mathrm{~cm}\) |
Subtopic: Standing Waves |
From NCERT
NEET - 2013
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