__________ is the hardest oxide and is hence used where high wear resistance at high temperature is required.

In a certain class 40% of the students are girls, and 20% of the girls wear glasses. What percent of students in the class are girls who wear glasses.

A

6%

B

8%

C

20%

At a symposium, 20% of the professors are psychologists , 60% are biologists and the remaining 12 professors are economist. If 20 of the professors wear glasses, what percent of the professors do not wear glasses?

A

20%

B

331/3%

C

50%

D

66.2/3%

Opponents of laws that require automobile drivers and passengers to wear seat belts argue that in a free society people have the right to take risks as long as the people do not harm the others as a result of taking risks.As a result,they conclude that it should be each person's decision whether or not to wear a seat belt. Which of the following, if true,most seriously weakens the conclusion drawn above ?

A

Many new cars are built with seat belts that automatically fasten when someone sits in the font seat.

B

Automobile insurance rates for all automobile owners are higher because of the need to pay for the increased injuries or deaths of people not wearing seat belts.

C

Passengers in airplanes are required to wear seat belts during takeoffs and landings.

D

The rate of automobile fatalities in districts that do not have mandatory seat-belt laws is greater than the rate of fatalities in districts that do have such laws.

The students wear blue uniform. Here the word 'wear" can be replaced by.

A

bear with

B

put on

C

put up

D

put off

নিম্নের কোন oxide টিকে উভধর্মী oxide বলে?

A

CaO

B

MgO

C

ZnO

D

CuO

Which metal oxide is an amphoteric oxide?

A

iron

B

aluminium

C

sodium

D

potassium

__________ is the hardest material out of the following.

A

Boron carbide

B

Tungsten carbide

C

Hardened steel

D

Silicon carbide

which of the following is the hardest element?

A

Iron

B

Diamond

C

Copper

D

Silicon

Which of the following is the hardest rock?

A

Granite

B

Coal

C

Chalk

D

Diamond

Which of the following is the hardest?

A

Austenite

B

Pearlite

C

Bainite

D

Martensite

__________ is the hardest oxide and is hence used where high wear resistance at high temperature is required.

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