Physics Test

Result

Physics Test - 20

Score
-
out of -
Rank
-
out of -

TIME Taken - -

SHARING IS CARING

If our Website helped you a little, then kindly spread our voice using Social Networks. Spread our word to your readers, friends, teachers, students & all those close ones who deserve to know what you know now.

Weekly Quiz Competition

Question 1
1 / -0

β-decay

A

Heavy water

B

Energy production in stars via hydrogen conversion to helium

C

Neutrino emission

D

Energy production in stars via hydrogen conversion to helium and Neutrino emission
Question 2
1 / -0

A

The particle experiences an attractive force towards x = 0 in the region |x|< a.

B

The force acting on the particle is zero at x = a.

C

The force acting on the particle is zero at x = 0.

D

All of these
Question 3
1 / -0

A

x = n, y = n, K-Sr = 129MeV, K-Xe = 86 MeV

B

x = p, y = e- , K-Sr = 129 MeV, K-Xe = 86 MeV

C

x = p, y = n, K-Sr = 129 MeV, K-Xe = 86 MeV

D

All of these
Question 4
1 / -0

The energy of a system as a function of time t is given as E(t) = A^2 exp(-αt), where α = 0.2 s^-1. The measurement of A has an error of 1.25 %. If the error in the measurement of time is 1.50 %, the percentage error in the value of E(t) at t = 5 s is

A

3

B

4

C

5

D

6
Question 5
1 / -0

Consider a concave mirror and a convex lens (refractive index = 1.5) of focal length 10 cm each, separated by a distance of 50 cm in air (refractive index = 1) as shown in the figure. An object is placed at a distance of 15 cm from the mirror. Its erect image formed by this combination has magnification M1. When the set- up is kept in a medium of refractive index 7/6, the magnification becomes M2. The magnitude | M2/M1 | is

A

9

B

8

C

7

D

6
Question 6
1 / -0

A
The force acting on the particle is zero at x = a.

B
The force acting on the particle is zero at x = – a.

C
The particle with total energy U0/4 can oscillate about the point x = – a.

D
All of these
Question 7
1 / -0

Four harmonic waves of equal frequencies and equal intensities I0 have phase angles 0, π/3, 2π/3 and π. When they are superposed, the intensity of the resulting wave is nI0. The value of n is

A

3

B

4

C

2

D

5
Question 8
1 / -0

A

α = 8, β = 6

B

α = 6, β = 4

C

α = 6, β = 0

D

α = 3, β = 3
Question 9
1 / -0

A body is projected vertically upwards. The times corresponding to height h while ascending and while descending are t1 and t2 respectively. Then the velocity of projection is (g is acceleration due to gravity)

A

Option A

B

Option B

C

Option C

D

Option D
Question 10
1 / -0

The figures below depict two situations in which two infinitely long static line charges of constant positive line charge density λ are kept parallel to each other. In their resulting electric field, point charges q and -q are kept in equilibrium between them. The point charges are confined to move in the x direction only. If they are given a small displacement about their equilibrium positions, then the correct statement(s) is(are)

A

Charge +q executes simple harmonic motion while charge -q continues moving in the direction of its displacement

B

Charge -q executes simple harmonic motion while charge +q continues moving in the direction of its displacement.

C

Both charges will continue moving in the direction of their displacement.

D

Both charges execute simple harmonic motion.