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Physics — Questions with Solutions

8 solved Physics questions from General Awareness, as asked in SSC CGL and other SSC exams. Read the answer and explanation below, then practise the full set in the practice section.

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Q1. Which instrument is used to measure atmospheric pressure?

वायुमंडलीय दबाव मापने के लिए किस उपकरण का उपयोग किया जाता है?

  1. A. Hygrometer
  2. B. Barometer
  3. C. Ammeter
  4. D. Altimeter

Solution

A barometer is a scientific instrument used to measure atmospheric pressure.

Q2. The value of 'g' (acceleration due to gravity) is minimum at:

'g' (गुरुत्वाकर्षण के कारण त्वरण) का मान न्यूनतम कहाँ होता है?

  1. A. The Equator
  2. B. The North Pole
  3. C. The South Pole
  4. D. The center of the Earth

Solution

The acceleration due to gravity (g) decreases with depth and becomes zero at the center of the Earth, which is its minimum value.

Q3. If Earth's radius shrinks by $1\%$ with mass constant, surface gravitational acceleration would:

यदि पृथ्वी का द्रव्यमान स्थिर रहे और त्रिज्या $1\%$ सिकुड़ जाए, तो सतह का गुरुत्वीय त्वरण:

  1. A. Rise by about 1%
  2. B. Fall by about 2%
  3. C. Rise by about 2%
  4. D. Fall by about 1%

Solution

$g \propto 1/R^2$. If $R$ decreases by $1\%$, $g$ increases by approximately $2 \times 1\% = 2\%$.

Q4. The key quantity allowing a satellite to sustain orbit without ongoing thrust is:

वह प्रमुख मात्रा (quantity) कौन सी है जो किसी उपग्रह को बिना निरंतर बल (thrust) के कक्षा में बने रहने की अनुमति देती है?

  1. A. Mass
  2. B. Gravitational force
  3. C. Orbital velocity
  4. D. Atmospheric drag

Solution

A sufficient orbital velocity provides the centrifugal effect needed to constantly balance Earth's gravitational pull, maintaining orbit.

Q5. One ampere of electric current is correctly defined as:

विद्युत प्रवाह (electric current) के एक एम्पीयर को सही ढंग से इस प्रकार परिभाषित किया गया है:

  1. A. Flow of 1 coulomb charge in 1 minute
  2. B. Flow of 1 coulomb charge in 1 second
  3. C. Flow of 1 joule energy in 1 second
  4. D. Flow of 1 volt potential per second

Solution

One Ampere is the rate of flow of 1 Coulomb of charge per second ($I = Q/t$).

Q6. One ampere of electric current is correctly defined as:

विद्युत प्रवाह (electric current) के एक एम्पीयर को सही ढंग से इस प्रकार परिभाषित किया गया है:

  1. A. Flow of 1 coulomb charge in 1 minute
  2. B. Flow of 1 coulomb charge in 1 second
  3. C. Flow of 1 joule energy in 1 second
  4. D. Flow of 1 volt potential per second

Solution

One Ampere is the rate of flow of 1 Coulomb of charge per second ($I = Q/t$).

Q7. When light enters from air into a medium, its speed changes. Which of the following properties of light remains constant during this transition?

जब प्रकाश वायु से किसी माध्यम में प्रवेश करता है, तो उसकी गति बदल जाती है। इस संक्रमण के दौरान प्रकाश का निम्नलिखित में से कौन-सा गुण स्थिर रहता है?

  1. A. Wavelength
  2. B. Frequency
  3. C. Speed
  4. D. Amplitude

Solution

The frequency of a light wave depends solely on the source and remains completely unaltered upon changing mediums.

Q8. An electric iron requires a ______ fuse to prevent short circuiting.

शॉर्ट सर्किट को रोकने के लिए एक इलेक्ट्रिक आयरन में ______ फ्यूज की आवश्यकता होती है।

  1. A. 4 A
  2. B. 3 A
  3. C. 2 A
  4. D. 5 A

Solution

An electric iron typically draws a higher current (around 4-5 Amperes depending on wattage), so a 5 A fuse is standard to prevent short circuits and handle the normal operational load.