Tiêu đề IMUmate Physics Practice Set-9.pdf ✅

IMUmate Physics Practice Set-9 1. Rest mass energy of electron is a. 1.02MeV b. 0.511KeV c. 0.511MeV d. 2.02MeV 2. When K.Emax of photoelectrons is zero then frequency of incident photon relative to threshold frequency is a. Less b. Equal c. Greater d. Small 3. Mass of 700N man moving in car at 66km/h is a. 70kg b. 100kg c. Infinite d. Zero 4. An inertial frame of reference is frame a. In which first law of motion is valid b. In which law of inertia is valid c. Which is not moving with uniform velocity d. Both a and b
5. In photocell cesium , coated oxidized silver cathode emits electrons for a. Visible light b. Ultraviolet c. Infrared light d. X- rays 6. According to theory of relative mass of an object is a. Depends on particles b. Speed of light c. Volume of object d. Area of object 7. Radiation with energy that is easily detected as quanta a. 1eV b. 1keV c. 1MeV d. 1010eV 8. Special theory of relativity treats is easily detected as quanta a. Inertial frame of reference b. Non-inertial frame of reference c. Non-acceleration frame of reference d. Accelerated frame of reference
9. According to special theory of relativity which one is not an absolute quantity a. Time b. Mass c. Height d. Both a and b 10. In e/m experiment we assume nature of electron as a. Wave b. Particle c. Photon d. Both a and b 11. Point of intersection of two coordinate axes is called a. Mid b. Origin c. Circumference d. Radius 12. Direction of resultant of two vectors is given by a. Arcos(Ay+By/Ax+Bx) b. Arcos(Ax+By/Ay+Bx) c. Arctan(Ay+By/Ax+Bx) d. Arctan(Ay-By/Ax-Bx) 13. A vector having magnitude only is called a. Scalar b. Resultant c. Unit vector d. Temperature
14. If value of moment arm is zero , then torque produced will be a. 1 b. 0 c. Doubled d. Decreased 15. Product of velocity and mass is called a. Momentum b. Work c. Acceleration d. Speed 16. Vector product of two vectors is also known as a. Scalar product b. Dot product c. Point product d. Cross product 17. Two forces 10N and 20N making an angle 300 and 600 will give resultant force of a. 15N b. 26N c. 27N d. 29N