Physics - Mock Test 27

Question 261

A vector can be multiplied by a number. The number may be?

A) dimensionless B) dimensional scalar C) negative D) all a, b and c are correct

---

No Details

Question 262

Addition of vector obeys?

A) commutative law B) distributive law C) associative law D) all given laws in a , b and c

---

No Details

Question 263

The direction of a vector in spece is specified by?

A) one angle B) two angle C) three angle D) no angle

---

No Details

Question 264

Rectangular coordinate system is also called?

A) polar coordinate system B) Cartesian coordinate system C) cylindrical coordinate system D) spherical coordinate system

---

No Details

Question 265

Electron moves in the orbit as?

A) Simple vibratory motion. B) Standing wave motion C) Vibratory motion like up and down. D) S.H.M like sound

---

No Details

Question 266

Compton effect proves the?

A) Photon theory of light B) Dual nature of light C) Wave nature of light D) Uncertain nature of light

---

No Details

Question 267

The uncertainty in momentum & position is due to its?

A) Property of matter and radiation. B) Two dimensional motion C) Emission of certain wavelength D) Very high velocity

---

No Details

Question 268

A three dimensional image is obtained by?

A) Electron microscope B) Seanning electron microscope C) Magnetic imaging D) None of the above

---

No Details

Question 269

In electron microscope electric & magnetic fields are used as?

A) Electromagnetic gun. B) Source of electromagnetic waves C) Deflecting charged particle D) Converging source of electrons

---

No Details

Question 270

In electron microscope we use energetic particles because of?

A) Penetrating power is high B) Kinetic energy is large C) Wavelength is very short. D) All the above reasons

---

No Details