1
NDA General Ability 13 April 2025
MCQ (Single Correct Answer)
+4
-1.33
Change Language
We hear an echo due to
1
Refraction of sound waves
2
Reflection of sound waves
3
Diffraction of sound waves
4
Resonance due to sound waves
2
NDA General Ability 13 April 2025
MCQ (Single Correct Answer)
+4
-1.33
Change Language
At uniform speed the acceleration is
1
Maximum
2
Minimum
3
Zero
4
Constant
3
NDA General Ability 13 April 2025
MCQ (Single Correct Answer)
+4
-1.33
Change Language
Which of the following main industry/industries was/were developed in the second industrial revolution that took place after about 1850 ?
1
Coal and iron
2
Cotton spinning and weaving
3
Chemical and electrical
4
steam engines 
4
NDA General Ability 13 April 2025
MCQ (Single Correct Answer)
+4
-1.33
Change Language
Which among the following materials was used in making the Harappan seals ?
1
Sandstone
2
Lapis lazuli
3
Jasper
4
Steatite
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