# The ground state energy of hydrogen atom is $$-13.6~\mathrm{eV}$$. The energy needed to ionize hydrogen atom from its second excited state will be:   1. $$13.6~\mathrm{eV}$$ 2. $$6.8~\mathrm{eV}$$ 3. $$1.51~\mathrm{eV}$$ 4. $$3.4~\mathrm{eV}$$

Subtopic:  Bohr's Model of Atom |
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A lens is made up of $$3$$ different transparent media as shown in the figure. A point object $$O$$ is placed on its axis beyond $$2f$$. How many real images will be obtained on the other side?

 1 $$2$$ 2 $$1$$ 3 No image will be formed 4 $$3$$
Subtopic:  Lenses |
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The diameter of a spherical bob, when measured with vernier callipers yielded the values: $$3.33$$ cm, $$3.32$$ cm, $$3.34$$ cm, $$3.33$$ cm and $$3.32$$ cm. The mean diameter to appropriate significant figures is:
1. $$3.328$$ cm
2. $$3.3$$ cm
3. $$3.33$$ cm
4. $$3.32$$ cm

Subtopic:  Measurement & Measuring Devices |
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On the basis of electrical conductivity, which one of the following material has the smallest resistivity?
1. Germanium
2. Silver
3. Glass
4. Silicon
Subtopic:  Derivation of Ohm's Law |
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The mechanical quantity, which has dimensions of reciprocal of mass $$(M^{-1}),$$ is:
 1 angular momentum 2 coefficient of thermal conductivity 3 torque 4 gravitational constant
Subtopic:  Dimensions |
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For the given cycle, the work done during the isobaric process is:

1. $$200$$ J
2. zero
3. $$400$$ J
4. $$600$$
Subtopic:  Work Done by a Gas |
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An AC source is connected to the given circuit. The value of $$\phi$$ will be:

 1 $$60^\circ$$ 2 $$90^\circ$$ 3 $$30^\circ$$ 4 $$45^\circ$$
Subtopic:  Different Types of AC Circuits |
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The given circuit is equivalent to:

 1 2 3 4
Subtopic:  Logic gates |
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The position of a particle is given by;
$$\vec r(t)=4t\hat i+2t^2\hat j+5\hat k$$
where $$t$$ is in seconds and $$r$$ in metre. Find the magnitude and direction of velocity $$v(t)$$, at $$t=1~\mathrm{s}$$, with respect to $$x$$-axis:
1. $$4\sqrt2~\text{ms}^{-1},45^\circ$$
2. $$4\sqrt2~\text{ms}^{-1},60^\circ$$
3. $$3\sqrt2~\text{ms}^{-1},30^\circ$$
4. $$3\sqrt2~\text{ms}^{-1},45^\circ$$
Subtopic:  Speed & Velocity |
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From NCERT
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 1 $$30~\mu \text{F}$$ 2 $$15~\mu \text{F}$$ 3 $$25~\mu\text{F}$$ 4 $$20~\mu\text{F}$$