### JEXPO 2013: Physics Question PART(1-25 Q)

1. When a person uses a convex lens as a simple magnifying glass the object must be placed at a distance.

- Less than the focal length
- More than the focal length
- Less than twice the focal length
- More than twice the focal length

- carbon
- lead
- helium
- hydrogen

- It absorbs heat
- It rejects heat
- Its temperature rises
- Its temperature falls

4. One surface of a lens is convex and the other is concave. If radii of curvature are r1 and r2 respectively, then the lens will be convex if :

5. An object is placed at a distance of

**f****/2**from a convex lens of focal length*. The image will be:***f**- At one of the foci, virtual and double of its size
- Greater than 1.5 but less than two times
- At 2f, virtual and erect
- None of these

6. A motorcycle and a car moving on a horizontal Road with the same velocity. If they are brought to rest by application of brakes, provided equal retardation then:

- The motorcycle will stop at a certain distance
- The car will stop at a shorter distance
- Both will stop at the same time
- Nothing can be predicted

7. Choose the Correct sequence of substances which are ordered in an increasing order of forces of attraction between the particles:

- Water, oxygen, sugar,
- Sugar, water, oxygen
- Sugar, oxygen, water
- Oxygen, water, sugar

8. In a Tsunami, the entire ocean, from the surface to the bottom, participate in the wave motion. For such waves, the wave speed is given by

**v = √gh**where g is the acceleration due to gravity and**h=3.5 km**, is the depth of the ocean surface. A Tsunami has been detected at a point**250 km**from the shore. How much time would it take to reach the shore?- 2.5 hours
- 1 hour
- 25 minutes
- 6 minutes

9. A thin wire of resistance 4Ω (4 Ohm) is bent to form a circle. The resistance across any diameter is :

- 4Ω
- 2Ω
- 1Ω
- 8Ω

10. The note middle

**C**played on the piano differs from middle**C**played on the violin because of a difference in :- Frequency
- Wavelength
- Fundamentals
- Harmonics

11. A batch of five resistors has the same value. The Ratio of the maximum and the minimum resistance that can be made out of them is :

- 05:01
- 10:04
- 02:01
- 25:01

12. Which device would most likely be classified as a load in an electrical circuit :

- Battery
- Lightbulb
- Ammeter
- Switch

13. If the wavelength if the sound wave increases, the pitch of the sound :

- Decreases
- Increases
- Remain unchanged
- None of these

14. A metallic wire of a specific resistance '

**s**' is stretched in such a way that its length is doubled and area of cross section is halved. Then the specific resistance of the wire will be :- 2s
- s/ 2
- s
- s/4

15. If a glass prism is placed inside water then is dispersive power :

- Remain unchanged
- Decreases
- Increases
- May increase or decrease depending on the dispersive angle of the prism

16. In the case of vibration, the restoring force is :

- Proportional to displacement
- Proportional to velocity
- Proportional to kinetic energy
- Proportional to potential energy

17. A current is passed through a conducting spring. Then this spring :

- Get compressed
- Gets expanded
- Oscillates
- Remain unchanged

18. The ratio of masses of two bodies

**P**and**Q**is 1:8 and the ratio of the kinetic energies is 2:1, then the ratio of their Momentums is :- 1:4
- 1:2
- 4:1
- 1:16

**M**moving with velocity

**v**in space explodes and breaks into two pieces. After the explosion, a mass

**m**of the spacecraft is left stationary. The velocity of the other part is :

*mv*/M-*m*- M
*v*/*(*M-*m*) - (M+
*m*)/M - M
*v/m*

- 𝝅/2
- 𝝅/4
- 𝝅
- 3𝝅/4

- 980 gm
- 1 kg
- 9.8 kg
- 1 gm

- M
^{0}L^{0}T^{0} - ML
^{-1}T^{-2} - ML
^{-3}T^{-0} - MLT
^{-2}

- 0
- 5kg-wt
- 10kg-wt
- 15kg-wt

^{-19}C, then the number of electrons passing through a section of wire per second, when the wire carries a current 2A, is :

- 1.25x10
^{17} - 1.6 x 10
^{17} - 1.25 x 10
^{19} - 1.6 x 10
^{19}

- √
*mE* *√*2*m*E- 2
*m*E - 2√
*m*E

NEXT PART(25-50 Q)

**Source:**Oriental MCQ (2018)

**Author:**Abhinandan Singh

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