JEE Main Physics MCQs - Part 1
Questions 1-10 of 1001. A projectile is fired at an angle of 45° with the horizontal. The elevation angle of the projectile at its highest point as seen from the point of projection is:
2. Two blocks of masses 2 kg and 4 kg are attached to the ends of a light string passing over a frictionless pulley. The acceleration of the system when released is (g = 10 m/s²):
3. A spring of force constant 800 N/m is stretched by 5 cm. The work done in stretching it from 5 cm to 10 cm is:
4. The moment of inertia of a uniform circular disc of mass M and radius R about an axis passing through its center and perpendicular to its plane is:
5. The escape velocity from the Earth's surface is 11.2 km/s. If a planet has a radius twice that of Earth and the same mean density, the escape velocity from its surface will be:
6. A point charge q is placed at the center of a cube of side L. The electric flux through any one face of the cube is:
7. In a potentiometer experiment, the balancing length is 250 cm for a cell of e.m.f. 1.5 V. If the cell is replaced by another cell of e.m.f. 2.1 V, the balancing length will be:
8. A proton and an alpha particle enter a uniform magnetic field perpendicularly with the same speed. The ratio of the radii of their circular paths (r_p : r_α) is:
9. The self-inductance of a solenoid is 5 mH. If the current changes from 1 A to 2 A in 0.1 s, the induced e.m.f. is:
10. In an LCR series circuit, at resonance, the phase difference between current and voltage is: