Physics Test 112

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Physics Test 112

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Weekly Quiz Competition

Question 1
4 / -1

If the condenser shown in the circuit is charged to 5V and connected in the circuit. The charge on the condenser at t = 12 µs will be :

A
10/e µC

B
e/10 µC

C
10/e² µC

D
e²/10 µC
Question 2
4 / -1

A Geostationary satellite is revolving around the earth. To make it escape from gravitational field of earth, its velocity must be increased-

A
100%

B
41.4%

C
50%

D
59.6%

Solution
Question 3
4 / -1

Two charges -9µC and +9µC are placed at the points P (1, 0, 4) m and Q (2, –1, 5) m located in the electric field Calculate torque acting on the dipole.

A
25 × 10^–7 N – m

B
25 × 10^–5 N – m

C
15 × 10^–7 N – m

D
15 × 10^–5 N – m

Solution
Question 4
4 / -1

There are two bulbs B₁ (P, V), B₂ (P, 2V) their rated power and voltages are mentioned with them. Calculate the ratio of consumed power w₁ and w₂ ?

A
25/4

B
4/25

C
10/4

D
4/10

Solution
Question 5
4 / -1

Calculate coefficient of mutual inductance of coil C₁ and C₂.

A
µ₀ πr²/ R

B
µ₀ πr²/ 2R

C
µ₀r²/ 2R

D
µ₀r²/ R

Solution
Question 6
4 / -1

Figure shows the graph of stopping potential versus the frequency of a photosensitive metal. The plank's constant and work function of the metal are- (V and υ₀ are two different constant.)

A
W_e = (2V)e; h = (3v)e / v₀

B
W_e = (2V)e; h = (2v)e / v₀

C
W_e = (3V)e; h = (3v)e / v₀

D
W_e = (3V)e; h = (2v)e / v₀

Solution

V_s = tan θ . υ + C

4V= tan θ . 2υ₀ + C

10V= tan θ. 4υ₀ + C
Question 7
4 / -1

For a substance the average life for α-emission is 3240 years and for β emission is 810 years. After how much time the 1/4 of the material remains by simultaneous emission :- [ℓn2 = 0.693]

A
648 years

B
324 years

C
449 years

D
898 years

Solution
Question 8
4 / -1

A bomb is projected with a velocity of 5 m/s at an angle θ from the horizontal ground. It explodes in two equal fragments at the maximum height. One of the fragments comes to rest just after explosion. Centre of mass of the fragments falls on the horizontal ground at a horizontal distance x from the point of projection. Taking sinθ = 4/5 and g = 10 m/s², the value of x would be

A
x = 2.4 m

B
x < 2.4 m

C
x > 2.4 m

D
None of these

Solution

After falling first fragment on the ground, horizontal velocity of c.m. remains unchanged but vertical acceleration decreases.
Question 9
4 / -1

A particle of mass 2kg initially moves with a velocity of Then coefficient of resitution will be

A
3/5

B
√5/13

C
1/2

D
2/3

Solution
Question 10
4 / -1

Consider diffraction by a slit of small width. O is point of central maxima, A is point closest to O where intensity is zero. Now if width of slit is increased slightly.

A
Intensity of O increases and point A shifts away from O.

B
Intensity of O increases and point A shifts towards O.

C
Intensity of O decreases and point A shifts aways from O.

D
Intensity of O decreases and point A shifts towards O.

Solution

More slit width more will be light intensity coming from it and width of central maxima decreases with slit width, so A will move towards O.