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SSC CPO 2019

SSC CPO 2019 Physics (9 Dec to 13 Dec) PDF Download

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SSC CPO 2019 Physics PDF Download

SSC CPO 2019 PDF 9 Dec to 13 Dec 2019

 

Total:- 12 Questions

Q.1:- During the occurrence of thunder and lightning:

गडगडाहट और आकाशीय तडित की घटना के दौरान: [09 Dec. CPO 2019 Eve Shift]

1. whether lightning is seen first or thunder is heard first will depend upon the distance and angle of the clouds vis-a-vis earth / क्या बिजली पहले दिखाई देती है या गड़गड़ाहट सुनाई देती है, यह पृथ्वी के बादलों की दूरी और कोण पर निर्भर करेगा

2. lightning is seen at the same time as thunder is heard / बिजली उसी समय देखी जाती है जिस समय गरज सुनाई देती है

3. thunder is heard before lightning is seen / बिजली गिरने से पहले गड़गड़ाहट सुनाई देती है

4. lightning is seen before thunder is heard / गडगडाहट सुनाई देने से पहले आकाशीय तडित दिखाई देती है |

Correct Answer:- lightning is seen before thunder is heard / गडगडाहट सुनाई देने से पहले आकाशीय तडित दिखाई देती है |

Comment:- Lightning can be seen before thunder is heard as light travels faster(about 300,000,000 m/s!) than sound. The speed of sound in air is just over 300m/s. The noise of thunder is caused by the rapid expansion of heating the air.

 

Q.2:- The term ‘Askaryan effect’ is associated with which functional area of science?

शब्द ‘अस्कैरियन प्रभाव’ विज्ञान के किस कार्यात्मक क्षेत्र से संबंधित है? 

[09 Dec. CPO 2019 Eve Shift]

1. Physics / भौतिकी विज्ञान

2. Geology / भू-गर्भशास्त्र

3. Chemistry / रसायन विज्ञान

4. Biology / जीव विज्ञान

Correct Answer:- Physics / भौतिकी विज्ञान

Comment:- The Askaryan radiation also known as the Askaryan effect is the phenomenon whereby a particle traveling faster than the phase velocity of light in a dense dielectric produces a shower of secondary charged particles that contain a charge anisotropy and thus emits a cone of coherent.

 

Q.3:- Which among the following is responsible for the rotation of the plane of oscillation of Foucault’s pendulum?

निम्नलिखित में से कौन फौकॉल्ट के पेंडुलम के दोलन की सतह के घूर्णन के लिए जिम्मेदार है? 

[11 Dec. CPO 2019 Eve Shift]

1. Centripetal force / केंद्राभिमुख बल

2. Viscous drag of air / हवा का विस्कस ड्रैग

3. Centrifugal force / अभिकेन्द्रीय बल

4. Coriolis force / कोरिओलिस बल

Correct Answer:- Coriolis force / कोरिओलिस बल

Comment:- The Foucault pendulum or Foucault’s pendulum is a simple device named after French physicist Léon Foucault and conceived as an experiment to demonstrate the Earth’s rotation.

The precession of the plane of oscillation of a pendulum, due to the Coriolis force, is used in many museums and observatories to demonstrate that the Earth is rotating. This method of making the Earth’s rotation manifest was first devised by Foucault in 1851.

 

Q.4: – Twin paradox is associated with:

ट्विन विरोधाभास के साथ जुड़ा हुआ है: [11 Dec. CPO 2019 Eve Shift]

1. the theory of relativity / सापेक्षता का सिद्धांत

2. particle physics / कण भौतिकी

3. hydrodynamics / हाइड्रोडायनामिक्स

4. quantum mechanics / क्वांटम यांत्रिकी

Correct Answer: – the theory of relativity / सापेक्षता का सिद्धांत

Comment: – Twin paradox, an apparent anomaly that arises from the treatment of time in German-born physicist Albert Einstein’s theory of special relativity. The counterintuitive nature of Einstein’s ideas makes them difficult to absorb and gives rise to situations that seem unfathomable.

 

Q.5: – Lactometers (used to determine the purity of a sample of milk) and hydrometers (used to determine the density of liquids) are based on the ______ principle.

लैक्टोमीटर (दूध के नमूने की शुद्धता निर्धारित करने के लिए उपयोग किया जाता है) और हाइड्रोमीटर (तरल पदार्थों के घनत्व को निर्धारित करने के लिए उपयोग किया जाता है) ______ सिद्धांत पर आधारित हैं। [12 Dec. CPO 2019 Mor Shift]

1. Archimedes / आर्किमिडीज़

2. Uncertainty / अनिश्चितता

3. Special Relativity / विशेष सापेक्षता

4. Relativity / सापेक्षता

Correct Answer:- Archimedes / आर्किमिडीज़

Comment:- The hydrometer (or lactometer) is based on Archimedes’ principle, which states that a solid suspended in a fluid is buoyed by a force equal to the weight of the fluid displaced by the submerged part of the suspended solids. Hence, the lower the density of the substance, the farther the hydrometer sinks.

 

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