JavaScript Questions & Answers – Asynchronous I/O with Rhino

This set of Javascript Multiple Choice Questions & Answers (MCQs) focuses on “Asynchronous I/O with Rhino”.

1. Which is a fast C++ based JavaScript interpreter?
a) Node
b) Sockets
c) Processors
d) Closures
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2. Why does the Node rely on event handlers?
a) APIs are synchronous
b) APIs are asynchronous
c) APIs are reusable
d) APIs are modular
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3. What is the command to run the node programs?
a) node(program.js)
b) program.js
c) node program.js
d) node.program.js
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4. What is the alternative command used in Node for load()?
a) store()
b) module()
c) log()
d) require()
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5. What is the command used for debugging output in Node?
a) print();
b) console.log(…);
c) debug(…);
d) execute(…);
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6. What is the code to print hello one second from now?
a) setTimeout(function() { console.log(“Hello World”); }, 1000);
b) setTimeout(function() { 1000, console.log(“Hello World”); });
c) setTimeout(function(1000) { console.log(“Hello World”); });
d) setTimeout(function() { console.log(“Hello World”); });
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7. Among the below given functions, Node supports which of the following client-side timer functions?
a) getInterval()
b) Interval()
c) clearTime()
d) clearTimeout()
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8. The necessary globals of a node are defined under which namespace?
a) variables
b) system
c) process
d) using
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9. Why does Node not block while waiting for operations to complete?
a) Static
b) Asynchronous
c) Synchronous
d) Recursive
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10. Which is the method used for registering handlers?
a) on()
b) register()
c) add()
d) include()
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Sanfoundry Global Education & Learning Series – Javascript Programming.