Safety rods provided in nuclear reactors to guard against accidents, in case of earthquake are made of

Nuclear reactors are provided with shield to guard against the emission of mainly __________ rays.

A

X

B

α and β

C

Neutrons & gamma

D

Infrared

A first order reaction is to be treated in a series of two mixed reactors. The total volume of the two reactors is minimum, when the reactors are

A

Equal in size

B

Of different sizes

C

Of such size that the ratio of their volumes is

D

None of these

The control rods in the control system of nuclear reactors are used to

A

Absorb excess neutrons

B

Control fuel consumption

C

Control temperature

D

All of these

when demand for factory's products is high . more money is spent at the factory for safety precautions and machinery maintenance than when demand is low. thus the average number of on -the-job accidents per employee each month should be lower during perids when demand is high than when demand is low and less money is available for safety precautions and machinery maintenance .when demand for its products is high, casts the most serious doubt on the conclusion drawn above?

A

Employees demand for higher wages than they do at other times.

B

Authority hires new workers but lacks the time to rain them properly.

C

Employees are less likely to lose their jobs than are at other times.

D

Authority sponsors a monthly safety award for each division in the factory.

When demand for a factory's products is high, more money is spent at the factory for safety precautions and machinery maintenance than demand is low. Thus the average number of on-the-job accidents per employee each month should be bower during periods when demand is high than when demand is low and less money is available for safety precautions and machinery maintenance. Which of the following,if true about a factory when demand for its product is high casts the most serious doubt on the conclusion drawn above?

A

Its employees ask for higher wages than they do at other times.

B

Its management hires new workers but lacks the time to train them properly.

C

Its employees are less likely to lose their jobs than they are at other times.

D

Its management sponsors a monthly safety award for each division in the factory.

Safety valves are provided in chemical equipments to guard against excessive

A

Temperature

B

Pressure/pressure fluctuation

C

Turbulence

D

Noise

Expert says 25% of of serious bicycle accidents involved head injury and that of all head injuries 80% are fatal. What percentage of serious bicycle accidents involve fatal head injuries?

A

16%

B

20%

C

55%

D

105%

Experts say that 25% of all serious bicycle accidents involve head injuries and of all such head injuries, 80% are fatal. What percentage of all serious bicycle accidents involve fatal head injuries?

A

6%

B

20%

C

55%

D

105%

Cars are safer than planes. Fifty percent of plane accidents result in death ,while only one percent of car accidents result in death . which of the following , if true, would most seriously weaken the argument above?

A

Planes are inspected more often than cars.

B

The number of car accidents is several hundred thousand times higher than the number of plane accidents.

C

Pilots never fly under the influence of alchohol, while car drivers often do.

D

Plane accidents are usually the fault of air traffic controllers, not pilots.

three meauring rods are 64 cm, 80 cm and 96 cm in length, What is the least length of cloth that can be measured exact number of times using any one of these rods ?

A

9.60 m

B

8,0 m

C

9.60 cm

D

96m

Safety rods provided in nuclear reactors to guard against accidents, in case of earthquake are made of

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