| 1 |
Radioactivity occurs naturally from all the elecments with atomic number greater than. |
|
| 2 |
Frequency of ultrasound is. |
- A. Less than 20 Hz
- B. 20 KHz
- C. 30 KHz
- D. More than 20 khn
|
| 3 |
The rays which are liberated from metal due to collision of fast moving electrons: |
- A. Alpha rays
- B. Beta rays
- C. Gamma rays
- D. x - rays
|
| 4 |
The Phenomenon of emission of radiations from radioactive elements is called: |
- A. Doping
- B. Allotropy
- C. Radioactivity
- D. Induction
|
| 5 |
Which type of rays are used in the solar system fitted on ships and submarines to find the hidden secrets under water: |
- A. x - rays
- B. C.T Scan
- C. Ultrasound
- D. Light
|
| 6 |
The light of laser is: |
- A. monochromatic
- B. dichromatic
- C. trichromatic
- D. Tetrachrmatic
|
| 7 |
During the preparation of the juice of sugarcane is heated from: |
- A. 100°C to 110°C
- B. 100° to 120°
- C. 100°C to 130°C
- D. 100°C to 140°C
|
| 8 |
If we increasing angle of incidence then at a particular angle incidence the angel of refraction is. |
- A. 45 <sup>o</sup>
- B. 60 <sup>o</sup>
- C. 30 <sup>o</sup>
- D. 90 <sup>o</sup>
|
| 9 |
Element having atomic numebr greater than.......... go on emitting radiations. |
|
| 10 |
The process of manufacturing food in pants; |
- A. Respiration
- B. Digestion
- C. Fermentation
- D. Photosynthesis
|
