- AA ferromagnetic material becomes paramagenetic.
- BA paramagnetic material becomes diamagnetic.
- CA ferromagnetic material becomes diamagnetic.
- DA paramagnetic meterial becomes ferromagnetic.
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A potentiometer consists of a wire of length 4 m and resistance 10Ω. It is connected to a cell of e.m.f. 2 V. The potential difference per unit length of the wire will be
|
(a) 0.5 V/m |
(b) 2 V/m |
(c) 5 V/m |
(d) 10 V/m |
'Mirage' is a phenomenon due to
|
(a) Reflection of light |
(b) Refraction of light |
|
(c) Total internal reflection of light |
(d) Diffraction of light |
The electron in the beam of a television tube move horizontally from south to north. The vertical component of the earth's magnetic field points down. The electron is deflected towards
|
(a) West |
(b) No deflection |
(c) East |
(d) North to south |
Two magnets are held together in a vibration magnetometer and are allowed to oscillate in the earth's magnetic field with like poles together, 12 oscillations per minute are made but for unlike poles together only 4 oscillations per minute are executed. The ratio of their magnetic moments is
| (a) 3 : 1 | (b) 1 : 3 | (c) 3 : 5 | (d) 5 : 4 |
For a colour of light the wavelength for air is 6000 Å and in water the wavelength is 4500 Å. Then the speed of light in water will be
|
(a) 5 |
(b) 2.25 |
(c) 4.0 |
(d) Zero |
A person is suffering from myopic defect. He is able to see clear objects placed at 15 cm. What type and of what focal length of lens he should use to see clearly the object placed 60 cm away
|
(a) Concave lens of 20 cm focal length |
(b) Convex lens of 20 cm focal length |
|
(c) Concave lens of 12 cm focal length |
(d) Convex lens of 12 cm focal length |