Physics Test 251

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Physics Test 251

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Weekly Quiz Competition

Question 1
4 / -1

In an experiment, the percentage of error occurred in the measurement of physical quantities A, B, C and D are 1%, 2%, 3% and 4%, respectively. Then the maximum percentage of error in the measurement X, where

A
(3/13)%

B
16%

C
−10%

D
10%

Solution
Question 2
4 / -1

According to the assumptions made in the kinetic theory of gases, when two molecules of a gas collide with each other then

A
neither kinetic energy nor momentum is conserved.

B
momentum is conserved but kinetic energy is not conserved.

C
both kinetic energy and momentum are conserved.

D
kinetic energy is conserved but momentum is not conserved.

Solution

From kinetic theory of gases all the collisions between walls and molecules and molecules and molecules considered to be elastic.

So conservation of momentum and kinetic energy is applicable.

For elastic collision, coefficient of restitution is one.
Question 3
4 / -1

For the given logic circuit; pick the correct option

A
For A = 1, B = 0,C = 0 ; Output = 1

B
For A = 0, B = 1,C = 1; Output = 1

C
For A = 1, B = 1, C = 0; Output = 0

D
For A = 0, B = 1,C = 1; Output = 0

Solution
Question 4
4 / -1

The energy of a photon is equal to the kinetic energy of a proton. If λ₁ is the de Broglie wavelength of a proton, λ₂ the wavelength associated with the photon and if the energy of the photon is E, then (λ₁/λ₂) is proportional to

A
E⁴

B
E^1/2

C
E²

D
E

Solution
Question 5
4 / -1

In an electromagnetic wave in free space the root mean square value of the electric field is E_rms = 6 V/m.

The peak value of the magnetic field is:-

A
2.83 × 10⁻⁸ T

B
0.70 × 10⁻⁸ T

C
4.23 × 10⁻⁸ T

D
1.41 × 10⁻⁸ T

Solution
Question 6
4 / -1

The position of the direct image obtained at O, when a monochromatic beam of light is passed through a plane transmission grating at normal incidence is shown in figure. The diffracted images A, B and C correspond to the first, second and third order diffraction. When the source is replaced by another source of shorter wavelength

A
all the four will shift in the direction C to O

B
all the four will shift in the direction O to C

C
the images C,B and A will shift towards O

D
the images C,B and A will shift away from O

Solution
Question 7
4 / -1

Two block of masses m₁ and m₂ are connected with a massless unstretched spring and placed over a plank moving with an acceleration 'a' as shown in figure. The coefficient of friction between the blocks and platform is μ.

A
spring will be stretched if a > μg

B
spring will be compressed if a ≤ μg

C
spring will neither be compressed nor be stretched for a ≤ μg

D
spring will be in its natural length under all conditions

Solution

Let the value of 'a' be increased from zero.

As long as a ≤ μg, there shall be no relative motion between m₁ or m₂ and platform, that is, m₁ and m₂ shall move with acceleration a.

As a > μg the acceleration of m₁ and m₂ shall become μg each. Hence at all instants the velocity of m₁ and m₂ shall be same

∴ The spring shall always remain in natural length.
Question 8
4 / -1

A 2.0 cm object is placed 15 cm in front of a concave mirror of focal length 10 cm. What is the size and nature of the image?

A
4 cm. real

B
4 cm, virtual

C
1.0 cm, real

D
None

Solution
Question 9
4 / -1

A particle of mass 1 mg and charge q is lying at the mid-point of two stationary particles kept at a distance 2 m when each is carrying same charge q. If the free charged particle is displaced from its equilibrium position through distance x (x << 1 m). The particle executes SHM. Its angular frequency of oscillation will be _______ × 10⁸ rad s⁻¹ (if q² = 10C²)

A
4

B
3

C
6

D
8

Solution
Question 10
4 / -1

Figure shows a rectangular copper plate with is centre of mass at the origin O and side AB = 2BC = 2 m. If a quarter part of the plate (shown as shaded) is removed, the centre of mass of the remaining plate would lie at

A
1/12 m,1/6 m

B
1/6 m, 1/12 m

C
1/3 m, 1/6 m

D
1/3 m,1/2 m

Solution