The physical quantity having the dimensions $$[M^{-1}L^{-3}T^3A^2]$$ is:
1. resistance
2. resistivity
3. electrical conductivity
4. electromotive force

Subtopic:  Dimensions |
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In the circuit shown the value of $$I$$ in ampere is:

1. $$1$$
2. $$0.60$$
3. $$0.4$$
4. $$1.5$$

Subtopic:  Kirchoff's Voltage Law |
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The specific charge of a proton is $$9.6\times10^7~\mathrm{C/kg}$$. The specific charge of an alpha particle will be:
1. $$9.6\times10^7~\mathrm{C/kg}$$
2. $$19.2\times10^7~\mathrm{C/kg}$$
3. $$4.8\times10^7~\mathrm{C/kg}$$
4. $$2.4\times10^7~\mathrm{C/kg}$$

Subtopic:  Various Atomic Models |
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If $$\lambda_1 ~\mathrm{ and}~ \lambda_2$$ are the wavelengths of the first members of the Lyman and Paschen series respectively, then  $$\lambda_1 : \lambda_2$$ is:
1. $$1:3$$
2. $$1:30$$
3. $$7:50$$
4. $$7:108$$

Subtopic:  Spectral Series |
From NCERT
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Activity of a radioactive sample decreases to $$\frac{1}{3}$$rd of its original value in $$3$$ days. Then, in $$9$$ days its activity will become:

 1 $$\frac{1}{27}$$ of the original value 2 $$\frac{1}{9}$$ of the original value 3 $$\frac{1}{18}$$ of the original value 4 $$\frac{1}{3}$$ of the original value

58%
From NCERT
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A tuning fork A produces $$4$$ beats/s with another tuning fork B of frequency $$320$$ Hz. On filing one of the prongs of A, $$4$$ beats are again heard when sounded with the same fork B. Then, the frequency of fork A before filing is:
1. $$328$$ Hz
2. $$316$$ Hz
3. $$324$$ Hz
4. $$320$$ Hz

Subtopic:  Beats |
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If there were no gravity, which of the following would not be there for a fluid?
1. Viscosity
2. Surface tension
3. Pressure
4. Archimedes upward thrust

Subtopic:  Archimedes' Principle |
52%
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A choke is preferred to resistance for limiting current in AC circuit because:

 1 choke is cheap 2 there is no wastage of power 3 choke is compact in size 4 choke is a good absorber of heat
Subtopic:  LR circuit |
59%
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The velocity-time curve for a body projected vertically upwards is:
1. parabola
2. ellipse
3. hyperbola
4. straight line

Subtopic:  Graphs |
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If $$r_1$$ and $$r_2$$ are the radii of the atomic nuclei of mass numbers $$64$$ and $$125$$ respectively, then the ratio $$\frac{r_1}{r_2}$$ is:
1. $$\frac{64}{125}$$
2. $$\sqrt{\frac{64}{125}}$$
3. $$\frac54$$
4. $$\frac45$$

Subtopic:  Various Atomic Models |
66%
From NCERT