General Science Jkssb Physics Set 1 Mcqs (448 MCQs) | JKSSB & SSC Quiz

General Science

jkssb physics set 1 mcqs

Download PDF

Topics

jkssb physics set 1 mcqs jkssb chemistry set 1 mcqs jkssb biology set 1 mcqs

Practice Questions

448 Total
Question 431 Discuss
Ask a Friend

Safety fuses work on the principle of:

A
magnetic effect of current
B
chemical effect of current
C
heating effect of current
D
mechanical effect of current

Answer & Explanation

Correct Option: C

Excess current generates enough Joule heat to melt the fuse wire and disconnect the circuit.
Question 432 Discuss
Ask a Friend

A ray of light traveling from a denser medium to a rarer medium at an angle greater than the critical angle undergoes:

A
refraction
B
total internal reflection
C
diffraction
D
scattering

Answer & Explanation

Correct Option: B

This occurs only when light moves from denser to rarer media and the angle of incidence exceeds the critical angle.
Question 433 Discuss
Ask a Friend

The working of a laundry dryer (spin dryer) is based on:

A
centripetal force
B
centrifugal force
C
surface tension
D
viscosity

Answer & Explanation

Correct Option: B

The rapid rotation forces water out through the holes in the drum due to centrifugal force.
Question 434 Discuss
Ask a Friend

Rainbow is formed due to a combination of:

A
refraction and absorption
B
dispersion and focusing
C
refraction, dispersion, and total internal reflection
D
reflection and interference

Answer & Explanation

Correct Option: C

Sunlight enters a water drop, refracts and disperses, reflects off the back surface, and refracts again upon exiting.
Question 435 Discuss
Ask a Friend

The value of acceleration due to gravity (g) is:

A
independent of the mass of the earth
B
independent of the mass of the body
C
same at all latitudes
D
zero on the surface of the earth

Answer & Explanation

Correct Option: B

$g = GM/R^2$. It depends on Earth's mass ($M$) but not on the mass of the object being dropped.
Question 436 Discuss
Ask a Friend

Which of the following materials is used as a moderator in nuclear reactors?

A
thorium
B
heavy water
C
radium
D
cadmium

Answer & Explanation

Correct Option: B

Moderators like heavy water or graphite slow down fast neutrons to sustain a controlled nuclear chain reaction.
Question 437 Discuss
Ask a Friend

A soap bubble appears colored in white light because of:

A
scattering
B
interference
C
diffraction
D
polarization

Answer & Explanation

Correct Option: B

Thin-film interference occurs as light reflects off the inner and outer surfaces of the soap film.
Question 438 Discuss
Ask a Friend

The hydraulic lift works on the principle of:

A
bernoullis law
B
archimedes law
C
pascals law
D
keplers law

Answer & Explanation

Correct Option: C

A small force applied to a small piston creates pressure that is transmitted to a larger piston, resulting in a large force.
Question 439 Discuss
Ask a Friend

The SI unit of power of a lens is:

A
meter
B
diopter
C
watt
D
candela

Answer & Explanation

Correct Option: B

One diopter is equal to the reciprocal of the focal length in meters ($1 m^{-1}$).
Question 440 Discuss
Ask a Friend

What is the primary cause of wind?

A
rotation of the earth
B
uneven heating of the earth surface
C
gravitational pull of the moon
D
oceanic currents

Answer & Explanation

Correct Option: B

Differences in temperature create air pressure gradients, causing air to move from high to low pressure areas.
Previous Next