1
NEET 2020 Phase 1
MCQ (Single Correct Answer)
+4
-1
A long solenoid of 50 cm length having 100 turns carries a current of 2.5 A. The magnetic field at the centre of the solenoid is :
$$\left( {{\mu _0} = 4\pi \times {{10}^{ - 7}}Tm{{A}^{-1}}} \right)$$
A
3.14 $${ \times {{10}^{ - 4}}T}$$
B
6.28 $${ \times {{10}^{ - 5}}T}$$
C
3.14 $${ \times {{10}^{ - 5}}T}$$
D
6.28 $${ \times {{10}^{ - 4}}T}$$
2
NEET 2020 Phase 1
MCQ (Single Correct Answer)
+4
-1
Taking into account of the significant figures, what is the value of $$9.99 m - 0.0099m$$?
A
9.98 m
B
9.980 m
C
9.9 m
D
9.9801 m
3
NEET 2020 Phase 1
MCQ (Single Correct Answer)
+4
-1
Light of frequency 1.5 times the threshold frequency is incident on a photosensitive material. What will be the photoelectric current if the frequency is halved and intensity is doubled?
A
four times
B
one-fourth
C
zero
D
doubled
4
NEET 2020 Phase 1
MCQ (Single Correct Answer)
+4
-1
The color code of a resistance is given below :
NEET 2020 Phase 1 Physics - Current Electricity Question 24 English
The values of resistance and tolerance, respectively, are
A
47 k$$\Omega $$ , 10%
B
4.7 k$$\Omega $$ , 5%
C
470 $$\Omega $$ , 5%
D
470 k$$\Omega $$ , 5%
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