1
NEET 2017
MCQ (Single Correct Answer)
+4
-1
The two nearest harmonics of a tube closed at one end and open at other end are 220 Hz and 260 Hz. What is the fundamental frequency of the system ?
A
20 Hz
B
30 Hz
C
40 Hz
D
10 Hz
2
NEET 2017
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Two cars moving in opposite directions approach each other with speed of 22 m s$$-$$1 and 16.5 m s$$-$$1 respectively. The driver of the first car blows a horn having a frequency 400 Hz. The frequency heard by the driver of the second car is (velocity of sound is 340 m s$$-$$1)
A
361 Hz
B
411 Hz
C
448 Hz
D
350 Hz
3
NEET 2017
MCQ (Single Correct Answer)
+4
-1
Suppose the charge of a proton and an electron differ slightly. One of them is $$-$$e, the other is (e + $$\Delta $$e). If the net of electrostatic force and gravitational force between two hydrogen atoms placed at a distance d (musch greater than atomic size) apart is zero, then $$\Delta $$e is of the order of
[Given : mass of hydrogen mh = 1.67 $$ \times $$ 10$$-$$27 kg]
A
10$$-$$23 C
B
10$$-$$37 C
C
10$$-$$47 C
D
10$$-$$20 C
4
NEET 2017
MCQ (Single Correct Answer)
+4
-1
A capacitor is charged by a battery. The battery is removed and another identical unchanged capacitor is connected in parallel. The total electrostatic energy of resulting system
A
decreases by a factor of 2
B
remains the same
C
increases by a factor of 2
D
increases by a factor of 4
EXAM MAP
Medical
NEET
Graduate Aptitude Test in Engineering
GATE CSEGATE ECEGATE EEGATE MEGATE CEGATE PIGATE IN
CBSE
Class 12