Model Questions for Scientific Assistant (IMD) Exam (Paper-2) PHYSICS - Set 37

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1. Faster among waves and rays is

A. waves
B. both have no speed
C. rays
D. both have equal speed

2. Electromagnetic waves obey law of

A. refraction only
B. reflection and refraction both
C. reflection only
D. momentum

3. Speed of electromagnetic waves in vacuum is

A. 30 × 108 m s-1
B. 4 × 108 m s-1
C. 3.0 × 108 m s-1
D. 6.0 × 108 m s-1

4. As speed decreases if we change medium of electromagnetic waves from air to water, frequency

A. also decreases
B. also increases
C. remains same
D. may increase or decrease

5. Electromagnetic waves that include light belong to

A. light spectrum
B. electronic spectrum
C. electromagnet group
D. electromagnetic spectrum

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6. Electromagnetic waves

A. transfer energy
B. cannot transfer energy
C. may transfer energy
D. are longitudinal

7. Energy passing through unit area is

A. intensity of x-ray
B. frequency of x-ray
C. wavelength of x-ray
D. amplitude of x-ray

8. X-rays are filtered out of human body by using

A. cadmium absorbers
B. carbon absorbers
C. copper absorbers
D. aluminum absorbers

9. Wavelength of x-rays is in range

A. 10-8 to 10-13 m
B. 10-7 to 10-14 m
C. 10-10 to 10-15 m
D. 102 to 109 m

10. If fast moving electrons rapidly decelerate, then rays produced are

A. alpha rays
B. beta rays
C. gamma rays
D. x-rays

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Answer

1. (c) 2. (b) 3. (c) 4. (c) 5. (d) 6. (a) 7. (a) 8. (d) 9. (a) 10. (d)