SPSC Lecturer Physics Past Papers

If vector field A = (x + 3y)i + (y - 2z)j + (x + mz)k is solenoidal, then the value of m is?

1. 2
2. 3
3. -2
4. 0

The parameters that Kepler’s Law of period relates to?

1. The semi-minor axis and the time period
2. Eccentricity and the time period
3. The planet’s area of sweep and the time period
4. The semi-major axis and the time period

What happens when the stress applied to the body is increased beyond the maximum value and is removed after some time?

1. The body will come back to its original position
2. The body will oppose the stress
3. The body becomes hot
4. The body cannot return to its original position

Which of the following is a four-level laser?

1. ND: YAG
2. Ruby laser
3. He-Ne laser
4. Semiconductor laser

A physical system undergoing forced vibration is called?

1. Free harmonic oscillation
2. Frequency harmonic oscillation
3. Driven harmonic oscillator
4. None

What is the effect of increasing the number of sits on the intensity of Central maxima of diffraction pattern of a diffraction grating?

1. Intensity of central maxima will decrease
2. Intensity of central maxima will increase
3. There will not be any effect
4. Diffraction pattern will disappear

Einstein’s photoelectric equation is?

1. hv = (1/2 mv^2) max
2. hv = 2hvo
3. hv = hvo + (1/2 mv^2) max
4. hv = hvo/2

FCC lattice is the reciprocal lattice of the?

1. BCC lattice
2. SC lattice
3. HCP lattice
4. Both B and C

A vector field with a vanishing curl is called as?

1. Solenoidal
2. Irrotational
3. Rotational
4. Cycloidal

Find the maximum value of resolving power of a grating 3 cm wide having 5000 lines per cm, if the wavelength of light used is 5890 A?

1. 40000Å
2. 45000Å
3. 4500Å
4. 5000Å