1
NEET 2018
MCQ (Single Correct Answer)
+4
-1
An electron falls from rest through a vertical distance h in a uniform and vertically upward directed electric field E. The direction of electric field is now reversed, keeping its magnitude the same. A proton is allowed to fall from rest in it through the same vertical distance h. The time of fall of the electron, in comparison to the time of fall of the proton is
A
smaller
B
5 times greater
C
10 times greater
D
equal
2
NEET 2018
MCQ (Single Correct Answer)
+4
-1
A tuning fork is used to produce resonance in a glass tube. The length of the air column in this tube can be adjusted by a variable piston. At room temperature of 27°C two successive resonances are produced at 20 cm and 73 cm of column length. If the frequency of the tuning fork is 320 Hz, the velocity of sound in air at 27°C is
A
330 m s–1
B
339 m s–1
C
350 m s–1
D
300 m s–1
3
NEET 2018
MCQ (Single Correct Answer)
+4
-1
A toy car with charge q moves on a frictionless horizontal plane surface under the influence of a uniform electric field $$\overrightarrow E $$ . Due to the force q$$\overrightarrow E $$ , its velocity increases from 0 to 6 m s–1 in one second duration. At that instant the direction of the field is reversed. The car continues to move for two more seconds under the influence of this field. The average velocity and the average speed of the toy car between 0 to 3 seconds are respectively
A
2 m s–1, 4 m s–1
B
1 m s–1, 3 m s–1
C
1 m s–1, 3.5 m s–1
D
1.5 m s–1, 3 m s–1
4
NEET 2018
MCQ (Single Correct Answer)
+4
-1
A battery consists of a variable number n of identical cells (having internal resistance r each) which are connected in series. The terminals of the battery are short-circuited and the current I is measured. Which of the graphs shows the correct relationship between I and n?
A
NEET 2018 Physics - Current Electricity Question 27 English Option 1
B
NEET 2018 Physics - Current Electricity Question 27 English Option 2
C
NEET 2018 Physics - Current Electricity Question 27 English Option 3
D
NEET 2018 Physics - Current Electricity Question 27 English Option 4
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