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Question 1. Which of the following alphabets look the same on reflection in a vertical mirror?
  1.    P
  2.    R
  3.    B
  4.    T
Answer: Option D
: D

Except 'T' all the other optionswould look different after reflection. For example:
But 'T' will look the same on reflection in a vertical mirror as shown below.

Question 2. A boy was cutting paper with scissors; he suddenly looked at scissors and thought that it might have symmetry. Which of the following options correctly shows the line of symmetry?
Answer: Option D
: A

Line of symmetry is a line with respect to which the two halves are mirror images of each other. We see that in the correct option, the line acts as a line of symmetry as the halves are mirror images of each other with respect to that line.

Question 3. Which of the following alphabets has two lines of symmetry?
  1.    U
  2.    X
  3.    B
  4.    A
Answer: Option B
: B

The alphabet 'X' has two lines of symmetry.
and 'A' 'B' and 'U' has only one line of symmetry as shown below.