Indian army has published the notification for SSC Tech 56 men and SSC Tech 27 women for the course commencing at OTA Chennai from April 2021
In a periscope, the two plane mirrors are kept
Parallel to each other
Perpendicular to each other
At an angle of 60° with each other
At an angle of 45° with each other
Which one of the following is not true about the image formed by a plane mirror?
It is of the same size as the subject.
It is laterally inverted.
It is real image.
It is formed as far behind the mirror as the object is in front.
Which one of the following is not a property of the X-rays?
They are deflected by electric fields.
They are not deflected by magnetic fields.
They have high penetration length in matter.
Their wavelength is much smaller than that of visible light.
The property of the sound waves that determines the pitch of the sound is its
Frequency
Amplitude
Wavelength
Intensity
Match List-I with List-II and select the correct answer using the code given below the Lists:
List-I(Compound) List-II(Use)
A) Boric acid - 1) Antiseptic
B) Citric acid - 2) Food preservative
C) Magnesium - 3) Antacid Hydroxide
D) Acetic acid - 4) Pickle
A-1 B-2 C-3 D-4
A-1 B-3 C-2 D-4
A-4 B-3 C-1 D-2
A-4 B-2 C-3 D-1
