Mathematics Test 20

Result

Mathematics Test 20

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Weekly Quiz Competition

Question 1
4 / -1

A tuning fork of known frequency 256 Hz makes 5 beats per second with the vibrating string of a piano. The beat frequency decreases to 2 beats per second when the tension in the piano string is slightly increased. The frequency of the piano string before increasing the tension was

A
(256 + 2) Hz

B
(256 − 2) Hz

C
(256 − 5) Hz

D
(256 + 5) Hz

Solution

The frequency of the piano string before increasing the tension was (256 − 5) Hz.
Question 2
4 / -1

The image formed by an objective of a compound microscope is

A
virtual and diminished

B
real and diminished

C
real and enlarged

D
virtual and enlarged

Solution

The objective of compound microscope is a convex lens. We know that a convex lens forms real and enlarged image when an object is placed between its focus and lens.