A) a laser beam of red light
B) magnetic dots
C) magnetic strips
D) All of these
View Answer
Option – A.
Similar Questions
The first Indian who was choosen as the secretary general of commonwealth is
At an examination in which maximum marks are 500. P got 10% less than Q, Q got 25% more than R and R got 20% less than S. If P got 360 marks what percentage of marks was obtained by S ?
Who is known as the father of Indian Economics?
The rate of change of linear momentum of a body falling freely under gravity is equal to it’s ____ ?
Who among the following was a slave of Muhammad Ghori? He became the ruler after the death of his master and founded the Slave Dynasty.
Amy has to visit towns B and C in any order. The roads connecting these towns with her home are shown on the diagram. How many different routes can she take starting from A and returning to A, going through both B and C (but not more than once through each) and not travelling any road twice on the same trip?
Which one of the following viruses is responsible for the recent death of lions in Gir National Park?
Who is the auther of the book Atal Ji Ne Kaha?
In India, which type of forest among the following occupies the largest area?
Which of the following serve as antibodies?