1
NEET 2018
MCQ (Single Correct Answer)
+4
-1
Change Language
The fundamental frequency in an open organ pipe is equal to the third harmonic of a closed organ pipe. If the length of the closed organ pipe is 20 cm, the length of the open organ pipe is
A
13.2 cm
B
8 cm
C
12.5 cm
D
16 cm
2
NEET 2018
MCQ (Single Correct Answer)
+4
-1
Change Language
A pendulum is hung from the roof of a sufficiently high building and is moving freely to and fro like a simple harmonic oscillator. The acceleration of the bob of the pendulum is 20 m s–2 at a distance of 5 m from the mean position. The time period of oscillation is
A
2$$\pi $$ s
B
$$\pi $$ s
C
2 s
D
1 s
3
NEET 2018
MCQ (Single Correct Answer)
+4
-1
Change Language
The electrostatic force between the metal plates of an isolated parallel plate capacitor C having a charge Q and area A, is
A
Independent of the distance between the plates
B
Linearly proportional to the distance between the plates
C
Proportional to the square root of the distance between the plates
D
Inversely proportional to the distance between the plates
4
NEET 2018
MCQ (Single Correct Answer)
+4
-1
Change Language
At what temperature will the rms speed of oxygen molecules become just sufficient for escaping from the Earth’s atmosphere?
(Given : Mass of oxygen molecule (m) = 2.76 × 10–26 kg, Boltzmann’s constant kB = 1.38 × 10–23 J K–1)
A
2.508 × 104 K
B
8.360 × 104 K
C
5.016 × 104 K
D
1.254 × 104 K
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