# The threshold frequency of a photoelectric metal is $$\nu_0.$$ If the light of frequency $$4\nu_0$$ is incident on this metal, then the maximum kinetic energy of emitted electrons will be: 1. $$h\nu_0$$ 2. $$2h\nu_0$$ 3. $$3h\nu_0$$ 4. $$4h\nu_0$$

Subtopic:  Einstein's Photoelectric Equation |
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The ratio of the magnitude of the magnetic field and electric field intensity of a plane electromagnetic wave in free space of permeability $$\mu_0$$ and permittivity $$\varepsilon_0$$ is:
(Given that $$c=$$ velocity of light in free space)
1.  $$c$$
2.  $$\frac1c$$
3.  $$\frac{c}{\sqrt{\mu_0\varepsilon_0}}$$
4.  $$\frac{\sqrt{\mu_0\varepsilon_0}}{c}$$
Subtopic:  Properties of EM Waves |
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The shape of the magnetic field lines due to an infinite long, straight current carrying conductor is:
1. a straight line
2. circular
3. elliptical
4. a plane
Subtopic:  Magnetic Field due to various cases |
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Match List-I with List-II:
 List-I (x-y graphs) List-II (Situations) (a) (i) Total mechanical energy is conserved (b) (ii) Bob of a pendulum is oscillating under negligible air friction (c) (iii) Restoring force of a spring (d) (iv) Bob of a pendulum is oscillating along with air friction

Choose the correct answer from the options given below:
 (a) (b) (c) (d) 1. (iv) (ii) (iii) (i) 2. (iv) (iii) (ii) (i) 3. (i) (iv) (iii) (ii) 4. (iii) (ii) (i) (iv)
Subtopic:  Spring mass system |
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Given below are two statements:
 Statement-I: The law of radioactive decay states that the number of nuclei undergoing the decay per unit time is inversely proportional to the total number of nuclei in the sample. Statement-II: The half life of a radionuclide is the sum of the left time of all nuclei, divided by the initial concentration of the nuclei at time $$t=0.$$
In the light of the above statements, choose the most appropriate answer from the options given below:

 1 Both Statement-I and Statement-II are correct. 2 Both Statement-I and Statement-II are incorrect. 3 Statement-I is correct but Statement-II is incorrect. 4 Statement-I is incorrect but Statement-II is correct.

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An ideal gas follows a process described by the equation $$PV^2=C$$ from the initial $$(P_1, V_1, T_1)$$ to final $$(P_2, V_2, T_2)$$ thermodynamics states, where $$C$$ is a constant. Then:
 1 $$\text{If}~P_1>P_2~\text{then}~T_1V_1~\text{then}~T_2>T_1$$ 3 $$\text{If}~V_2>V_1~\text{then}~T_2P_2~\text{then}~V_1>V_2$$
Subtopic:  Types of Processes |
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A standard filament lamp consumes $$100$$ W when connected to $$200$$ V AC mains supply. The peak current through the bulb will be:
1. $$0.707$$ A
2. $$1$$ A
3. $$1.414$$ A
4. $$2$$ A
Subtopic:  RMS & Average Values |
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Let $$R_1$$ be the radius of the second stationary orbit and $$R_2$$ be the radius of the fourth stationary orbit of an electron in Bohr's model. The ratio $$\frac{R_1}{R_2}$$ is:
1. $$0.25$$
2. $$0.5$$
3. $$2$$
4. $$4$$
Subtopic:  Bohr's Model of Atom |
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The physical quantity that has the same dimensional formula as pressure is:
1. Force
2. Momentum
3. Young's modulus of elasticity
4. Coefficient of viscosity
Subtopic:  Dimensions |
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An energy of $$484$$ J is spent in increasing the speed of a flywheel from $$60$$ rpm to $$360$$ rpm. The moment of inertia of the flywheel is:
1. $$0.7$$ kg-m2
2. $$3.22$$ kg-m2
3. $$30.8$$ kg-m2
4. $$0.07$$ kg-m2
Subtopic:  Moment of Inertia |
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