Question
Current in the circuit will be
|
(a) |
(b) |
(c) |
(d) |
✓
Answer
(b) 
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(1): The dielectric medium between the plates of a parallel plate capacitor lowers the potential difference between the plates without a battery.
(2): The maximum electric field that a dielectric can withstand without causing it to break down is dielectric strength.
(2): The maximum electric field that a dielectric can withstand without causing it to break down is dielectric strength.
A sphere can roll on a surface inclined at an angle $\theta$ if the friction coefficient is more than $\frac{2}{7}\text{g}\tan \theta.$ Suppose the friction coefficient is $\frac{1}{7}\text{g}\tan \theta.$ If a sphere is released from rest on the incline:
→- It will stay at rest.
- It will make pure translational motion.
- It will translate and rotate about the centre.
- The angular momentum of the sphere about its centre will remain constant.
A short magnetic needle is pivoted in a uniform magnetic field of strength 1 T. When another magnetic field of strength 
is applied to the needle in a perpendicular direction, the needle deflects through an angle q, where q is
|
(a) 30o |
(b) 45o |
(c) 90o | (d) 60o |
A rocket is moving away from the earth at a speed of 6 
, The rocket has blue light in it. What will be the wavelength of light recorded by an observer on the earth (wavelength of blue light = 4600 Å)
|
(a) 4600 Å |
(b) 5520 Å |
(c) 3680 Å |
(d) 3920 Å |
In beta decay
|
(a) The parent and daughter nuclei have same number of protons |
|
(b) The daughter nucleus has one proton less than the parent nucleus |
|
(c) The daughter nucleus has one proton more than the parent nucleus |
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(d) The daughter nucleus has one neutron more than the parent nucleus |
Light of frequency 8 
is incident on a substance of photoelectric work function 6.125eV. The maximum kinetic energy of the emitted photoelectrons is
|
(a) 17eV |
(b) 22eV |
(c) 27eV |
(d) 37eV |
In a transistor in CE configuration, the ratio of power gain to voltage gain is
|
(a) a |
(b) b / a |
(c) ba |
(d) b |
Which of the following are electromagnetic waves?
→- $\alpha-\text{decay}$
- $\beta^+-\text{decay}$
- $\beta^--\text{decay}$
- $\gamma-\text{decay}$
Assertion : In the process of photoelectric emission, all the emitted photoelectrons have the same kinetic energy.
Reason : The photon transfers its whole energy to the electron of the atom in photoelectric effect.
|
(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
|
(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
|
(c) If assertion is true but reason is false. |
|
(d) If assertion is false but reason is true. |
Which of the following is diamagnetism
|
(a) Aluminium |
(b) Quartz |
(c) Nickel |
(d) Bismuth |