1
COMEDK 2023 Evening Shift
MCQ (Single Correct Answer)
+1
-0

The nucleus of a helium atom travels along the inside of a straight hollow tube $$4 \mathrm{~m}$$ long which forms part of a particle accelerator. If one assumes uniform acceleration, how long is the particle in the tube if it enters at a speed of $$2000 \mathrm{~m} / \mathrm{s}$$ and leaves at $$8000 \mathrm{~m} / \mathrm{s}$$

A
$$0.6 \times 10^{-4}$$ s
B
$$4 \times 10^{-4} \mathrm{~s}$$
C
$$8 \times 10^{-4} \mathrm{~s}$$
D
$$3.3 \times 10^{-4} \mathrm{~s}$$
2
COMEDK 2023 Evening Shift
MCQ (Single Correct Answer)
+1
-0

In the given circuit the diode $$D_1$$ and $$D_2$$ have the forward resistance $$25 \Omega$$ and infinite backward resistance. When they are connected to the source as shown, the current passing through the $$175 \Omega$$ resistor is:

COMEDK 2023 Evening Shift Physics - Semiconductor Devices and Logic Gates Question 7 English

A
0.095 A
B
0.044 A
C
0.028 A
D
0.04 A
3
COMEDK 2023 Evening Shift
MCQ (Single Correct Answer)
+1
-0

The radius of the current carrying circular coil is doubled keeping the current passing through it the same. Then the ratio of the magnetic field produced at the centre of the coil before the doubling of the radius to the magnetic field after doubling of the radius.

A
1 : 2
B
2 : 1
C
2 : 3
D
3 : 2
4
COMEDK 2023 Evening Shift
MCQ (Single Correct Answer)
+1
-0

If the resultant of all external forces acting on a system of particles is zero, then from an inertial frame one can surely say that

A
Linear momentum of the system does not change in time
B
Kinetic energy of the system does not change in time.
C
Potential energy of the system does not change in time.
D
Angular momentum of the system does not change in time
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