Semaphore is actually a variable or abstract data type which controls access to a common resource by multiple processes. Semaphores are of two types -
☛ Binary semaphore – It can have only two values (0 and 1). The semaphore value is set to 1 by the process in charge, when the resource is available.
☛ Counting semaphore – It can have value greater than one. It is used to control access to a pool of resources.
What is (79 × 106)/(12 × 10-8) A. 6,580 × 1012 B. 658 × 1010 C. 6.58 × 1014 D. 0.658 × 1016
The number 4,500,000 can be expressed as A. 4,500 × 106 B. 4.5 × 106 C. 4.5 × 10-3 D. either 4,500 × 103 or 4.5 × 106
The quantity 43 × 10-3 is the same as A. 0.043 B. 0.430 C. 430 D. 43,000
Current is measured in A. watts B. volts C. henries D. amperes
The number of megohms in 0.03 kilohms is A. 0.00002 M B. 0.0002 M C. 3 × 10-5 M D. either 0.00002 M or 0.0002 M
Voltage is measured in A. volts B. farads C. watts D. ohms
The bodies which rebound after impact are called A. inelastic bodies B. elastic bodies C. neither elastic nor inelastic bodies D. none of these
The number 0.0003 multiplied by 10-3 is A. 0.0000003 B. 0.0003 C. 3 D. 3,000
The number 4.4 × 106 ohms expressed using a metric prefix is A. 4 k B. 4.4 k C. 4 M D. 4.4 M
When a particle moves along a circular path with uniform velocity, there will be no tangential acceleration. A. Correct B. Incorrect
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