What is the name of the CalTech seismologist who invented the scale used to measure the magnitude of earthquakes?

The device which measures earthquakes is called the Richter scale.

A

prevents

B

weighs

C

gauges

D

calculates

Dilute wine was used as a thermometric liquid initially to develop temperature scale. First emperical temperature scale developed was the __________ scale.

A

Kelvin

B

Centigrade

C

Fahrenheit

D

Reaumer

An engineer's scale would be used to measure lines on a drawing where the scale factor reads ________.

A

$${\frac{1}{4}^{''}} = {1^{'}}{\text{ - }}{0^{''}}$$

B

$${\frac{1}{8}^{''}} = {1^{'}}{\text{ - }}{0^{''}}$$

C

$${1^{''}} = {100^{'}}$$

D

$${\frac{3}{4}^{''}} = {1^{'}}{\text{ - }}{0^{''}}$$

A special lottery is to be held to select the student who will live in the only deluxe room in a dormitory . There are 100 seniors, 150 juniors and 200 sophomres who applied. Each senior's junior's name , 2 times; and each sophomres who applied. Each senior's name is placed in the lottery 3 times; each junior's name ,2 times name, 2 times ; and each sphomore's name , 1 time . What is the probability that a senior's name will be chosen?

A

18

B

38

C

48

D

28

Two forces of magnitude 3m and 2m respectively have a resultant R. if the first force is doubled, the magnitude of the resultant is doubled.Find the angle betuween forces?

A

90°

B

120°

C

135°

D

145°

q মানের পাঁচটি ধনাত্নক চার্জ r ব্যাসার্ধের একটি বৃত্তের পরিধি বরাবর প্রতিসমভাবে সাজানো হলো। বৃত্তের কেন্দ্রে বৈদ্যুতিক ক্ষেত্রের মান কত? (Five positive charges of magnitude q are arranged symmetrically along the circumference of a circle of radius r. What is the magnitude of the electric field at the center of the circle?)

A

q44πε0r2

B

q54πε0r2

C

5q4πε0r2

Parallelogram Law of Forces states, "if two forces acting simultaneously on a particle be represented in magnitude and direction by two adjacent sides of a parallelogram, their resultant may be represented in magnitude and direction by

A

Its longer side

B

Its shorter side

C

The diagonal of the parallelogram which does not pass through the point of intersection of the forces

D

The diagonal of the parallelogram which passes through the point of intersection of the forces

For an annual flood series arranged in descending order of magnitude, the return for a magnitude listed at position period m in a total data N is

A

$$\frac{{\text{m}}}{{\text{N}}}$$

B

$$\frac{{\text{m}}}{{{\text{N}} + 1}}$$

C

$$\frac{{{\text{N}} + 1}}{{\text{m}}}$$

D

$$\frac{{\text{N}}}{{{\text{m}} + 1}}$$

If two forces each equal to ‘T’ in magnitude act at right angles, their effect may be neutralized by a third force acting along their bisector in opposite direction whose magnitude will be

A

2T

B

$$\frac{1}{2}{\text{T}}$$

C

$$\sqrt 2 {\text{ T}}$$

D

3T

With which device are earthquakes recorded ?

A

Barometer

B

Oscillator

C

Voltmeter

D

Seismograph

What is the name of the CalTech seismologist who invented the scale used to measure the magnitude of earthquakes?

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